Del Mar Photonics - Del Mar Photonics at Optics and Photonics 2008 - Pump-probe - Multiphoton
Femtosecond laser processing with adaptive optics (Paper
Presentation)
Paper 7042-17 of Conference 7042
Authors(s): K.-C. Cho, Shean-Jen Chen, National Cheng Kung Univ. (Taiwan)
Date: Sunday, 10 August 2008
In order to accomplish a fast and accurate processing, a two-axis beam scanner,
a acousto-optic modulator (AOM), and an adaptive optics system (AOS) controlled
by a digital signal processor (DSP) are integrated into a femtosecond laser
processing system. The laser system utilizes CAD software to design the
processing route and exports a drawing interchange format (DXF) file. Then, the
DSP with the related processing information from the DXF file and send command
signals to the beam scanner and the AOM. In order to achieve the
diffraction-limit laser processing spot, the AOS with a 37-element deformable
mirror will adjust the laser wavefront based on off-line wavefront detection to
reduce the aberrations from the laser system or processed samples.
A nanometer-sized few femtosecond electron source at
high-repetition rates (Paper Presentation)
Paper 7032-12 of Conference 7032
Authors(s): Christoph Lienau, Carl von Ossietzky Univ. Oldenburg (Germany)
Date: Sunday, 10 August 2008
We describe and demonstrate a novel approach towards realizing a nanometer-sized
ultrafast electron source. By illuminating ultrasharp gold tips with 7-fs pulses
from an 80 MHz Ti:sapphire oscillator, we induce emission of an intense flux of
up to 10 Million electrons per second. Due to the local field enhancement this
emission is strongly localized at the apex of the metallic tip with a radius of
curvature of only few tens of nanometers. We demonstrate the multiphoton
character of the electron generation in the absence of a tip bias voltage. The
results of first imaging experiments using this novel electron source will be
presented, demonstrating near-field imaging of local electric fields with about
20 nm spatial resolution.
Femtosecond coherent control of surface plasmon propagating
direction (Paper Presentation)
Paper 7032-13 of Conference 7032
Authors(s): SooBong Choi, Doo-Jae Park, YeoChan Yoon, Seoul National Univ.
(South Korea); JiHoon Kang, Q-Han Park, Korea Univ. (South Korea); D. S. Kim,
Seoul National Univ. (South Korea)
Date: Sunday, 10 August 2008
We experimentally demonstrate that it is possible to control surface plasmon
polaritons (SPP) propagation direction from a nano-slit launcher, using
femtosecond coherent-control. In the investigated one-dimensional nano-optical
system, the flow of electromagnetic energy is controlled at the desired
direction defined by the in-plane wavevector of the interfering SPP fields. In
the present case, the temporal-phase dependent optical nearfield distribution is
governed by the spectrally selective coupling to SPP modes at grooves.
Femtosecond modulation of surface plasmon-polariton propagation
(Paper Presentation)
Paper 7032-14 of Conference 7032
Authors(s): Kevin F. MacDonald, Zsolt Samson, Nikolay I. Zheludev, Univ. of
Southampton (United Kingdom); Mark I. Stockman, Georgia State Univ.
Date: Sunday, 10 August 2008
We report on a new way of controlling the propagation of surface plasmon
polariton waves on a metal/dielectric interface using femtosecond optical
pulses.
Control of surface plasmons with phase-correlated femtosecond
light fields (Paper Presentation)
Paper 7032-15 of Conference 7032
Authors(s): Atsushi Kubo, Univ. of Tsukuba (Japan); Hrvoje Petek, Univ. of
Pittsburgh
Date: Sunday, 10 August 2008
Optical control of surface plasmon (SP) fields and its time-resolved microscopic
imaging are demonstrated by means of phase-correlated 10fs laser pulse pair
excitation of two photon photoemission combined with photoemission electron
microscopy. Excitation pump-probe light pulses, with mutual delay controlled to
better than 50as accuracy, couple to SPs at nano-scale optical patterns
fabricated in deposited silver films. Evolution of the SP fields is imaged
thorough a polarization grating created by interference with the external
excitation light field. Simulation based on the complex SP wave vector and
Huygens' principle explains the experimental results.
Formation of femtosecond bessel and conical light beams by single
and double axicons (Paper Presentation)
Paper 7062-2 of Conference 7062
Authors(s): Svetlana N. Kurilkina, Vladimir N. Belyi, Nikolai S. Kazak, Anatolii
A. Ryzhevich, B.I. Stepanov Institute of Physics (Belarus)
Date: Monday, 11 August 2008
The properties of the transformation of a pulse beam to femtosecond Bessel light
beam (FBLB) using axicons are investigated theoretically and experimentally. The
dependence of group velocity of FBLB on dispersion of the axicon material and
its base angle is established. The appearance of super-short satellite pulse
with envelope maximum depending on incident pulse duration is predicted and
correctly explained. New techniques for controlling the spatial form of FBLB,
based on including additional lenses and tunable-diameter diaphragm are
developed and experimentally tested. A new method of forming the super-short
pulsed beams of Bessel type using double-axicon is proposed and elaborated.
Femtosecond laser pulse filament robustness in aerosol layer
(Paper Presentation)
Paper 7090-12 of Conference 7090
Authors(s): Elena P. Silaeva, M.V. Lomonosov Moscow State Univ. (Russia)
Date: Tuesday, 12 August 2008
The robustness and recoverability of the high-power femtosecond laser pulse
filament in the presence of atmospheric aerosol scattering layer was studied by
means of computer simulations.
The obtained 3D-distributions of fluence and electron density in a laser
filament demonstrate that these parameters acquire a stochastic character inside
the aerosol layer and recover on leaving it.
Filament energy decreases with distance inside the layer because of the water
particles scattering and after the layer because of the amplitude-phase
distortions induced by aerosol particles. The equivalence of nonlinear aerosol
medium and linear damping medium with equal to dispersive dissipations was
investigated.
Modelling of femtosecond pulse propagation through dense
scattering media (Paper Presentation)
Paper 7065-31 of Conference 7065
Authors(s): Nicolas Rivière, Barthelemy Marie, Laurent Hespel, Thibault
Dartigalongue, ONERA (France)
Date: Tuesday, 12 August 2008
We study the interaction of femtosecond polarized light pulse with a scattering
medium considering Monte-Carlo simulation. The Monte Carlo scheme is based on
temporal photon pursuing, including a pseudo MC approximation associated to two
small detectors in forward and backward directions. The statistical scattering
properties are derived from temporal Mueller matrices, that are evaluated
through a scanning of frequency associated to the Lorenz-Mie theory.
We specially focused our attention on solid rocket motor modelling. In such
scattering medium, large optical thickness, various bimodal particle size
distributions and concentration gradients could be observed.
Surface profile measurement of silicon wafers using a femtosecond
pulse laser (Paper Presentation)
Paper 7063-35 of Conference 7063
Authors(s): Taekmin Kwon, Ki-Nam Joo, Seung-Woo Kim, Korea Advanced Institute of
Science and Technology (South Korea)
Date: Tuesday, 12 August 2008
We investigated the possibility of exploiting a femtosecond pulse laser as the
light source for the low-coherence interferometer designed for inspection of
silicon wafers. The intension is to measure both the front and rear surface
profiles of a bare silicon wafer simultaneously as the femtosecond laser
provides a near-infrared spectrum transparent to silicon. The spectrum is
further widened using a photonic crystal fiber to cover the wavelength range of
1000 to 1100 nm, which is not only transmittable through silicon but also
detectable by an ordinary CCD photodetector array.
PbTe quantum dots multilayer grown by femtosecond laser ablation
(Paper Presentation)
Paper 7056-9 of Conference 7056
Authors(s): Eugenio Rodriguez, Lourdes Moya, Ricardo S. Moreira, Walfrido A.
Pippo, Carlos L. Cesar, Luiz C. Barbosa, Univ. Estadual de Campinas (Brazil)
Date: Wednesday, 13 August 2008
In the present work, PbTe quantum dots embedded in a dielectric host (SiO2) were
fabricated. The samples were fabricated by alternating between the laser
ablation technique and the Plasma Enhanced Chemical Vapor Deposition (PECVD)
thechniques. This alternating growth was achieved with a computer controlled
interface using a LabView code.
The semiconductor quantum dots were grown by femto second laser ablation of a
PbTe target using an ultra short pulsed laser (100 fs; 1 mJ) at a central
wavelength of 200 nm.
The glass matrix was fabricated by a plasma chemical vapor deposition method
using vapor of tetramethoxysilane (TMOS) as precursor. The structural and
optical properties of the multilayer were studied.
SiO2-based variable microfluidic lenses fabricated by femtosecond
laser lithography-assisted micromachining (Paper Presentation)
Paper 7039-13 of Conference 7039
Authors(s): Mizue Mizoshiri, Hiroaki Nishiyama, Osaka Univ. (Japan); Junji
Nishii, National Institute of Advanced Industrial Science and Technology
(Japan); Yoshinori Hirata, Osaka Univ. (Japan)
Date: Wednesday, 13 August 2008
SiO2-based variable microfluidic lenses were fabricated by femtosecond laser
lithography-assisted micromachining, which was a proposed combined process of
femtosecond laser lithography and plasma etching. Resist patterns of
continuous-relief micro-Fresnel lenses were directly written inside chemically
amplified negative-tone photoresist on SiO2-based microchannels of 250 um width
and 6 um depth using nonlinear optical effects induced by femtosecond laser
pulses. SiO2-based micro-Fresnel lenses with smooth surface were formed on the
bottom of microchannels by plasma etching. The characteristics of these variable
microlenses will be reported in detail.
Femtosecond micro- and nano-machining of materials for
microfluidic applications (Paper Presentation)
Paper 7039-18 of Conference 7039
Authors(s): Yelena V. White, Matthew Parrish, Xiaoxuan Li, Lloyd Davis, William
Hofmeister, Univ. of Tennessee Space Institute
Date: Wednesday, 13 August 2008
Ultrafast laser micromachining is a promising candidate for micro- and nano-fabrication
technology. Due to the high precision of femtosecond ablation, laser-machined
features can be added to lithography-prototyped device. To accomplish that,
parametric studies of laser interrogation of materials of interest are
necessary. We present femtosecond laser ablation studies of glass, PDMS, fused
silica, and diamond films. Samples were ablated by 800 nm with pulse width of
200 fs laser and repetition rates of up to 250 kHz. Our results include single-
and multi-pulse laser machining for fluidic and photonic devices. Feature size
and structural dependences on ablation rates are discussed.
Femtosecond shape transformation dynamics of silver nanoparticles
in glass (Paper Presentation)
Paper 7032-80 of Conference 7032
Authors(s): Ahmet A. Unal, Andrei Stalmashonak, Gerhard Seifert, Heinrich
Graener, Martin-Luther Univ. Halle-Wittenberg (Germany)
Date: Thursday, 14 August 2008
Irradiation of spherical silver nanoparticles in glass by linearly-polarized
femtosecond laser pulses close to the surface plasmon resonance results in
irreversible shape transformations. To investigate the transformation dynamics
we introduce a single-color double-pulse experiment, where the sample is
irradiated by two time-delayed pulses of equal intensity. Varying the delay
between pulses upto 1 ns and analyzing the shift of polarized absorption bands
for each delay give valuable information on the evolution of shape
transformations. Possible transformation mechanisms including electron gas
thermalization, electron-phonon coupling and excess energy transfer from the
nanoparticle to the glass matrix are observed and discussed.
Optical pulse shaping and applications (Paper Presentation)
Paper 7062-6 of Conference 7062
Authors(s): Andrew M. Weiner, Purdue Univ.
Date: Monday, 11 August 2008
Femtosecond optical pulse shaping is by now an established technology allowing
generation of essentially arbitrary ultrafast optical waveforms according to
user specification. Waveform generation is accomplished via a Fourier synthesis
method, which reflects phase, amplitude, and polarization information placed
onto the optical spectrum via a spatial light modulator. Applications span
lightwave communications, coherent control of quantum mechanical processes, few
femtosecond pulse compression, nonlinear optical microscopy, and microwave
photonics. In this talk I will first discuss the basics of pulse shaping and
then survey recent topics of interest within my group at Purdue University.
Dispersion compensation of femtosecond laser pulses by maximising
a second harmonic signal with a feedback loop containing a genetic search
algorithm and an acoustic-optic modulator (Poster Presentation)
Paper 7062-51 of Conference 7062
Authors(s): Andrew Mori, Univ. Stellenbosch (South Africa) and CSIR National
Laser Ctr. (South Africa); Lourens R. Botha, Anton du Plessis, Ted Roberts,
Hendrik Maat, CSIR National Laser Ctr. (South Africa)
Date: Monday, 11 August 2008
No description available
Silica-based diffractive/refractive hybrid microlenses fabricated by multiphoton
lithography (Poster Presentation)
Paper 7056-55 of Conference 7056
Authors(s): Hiroaki Nishiyama, Mizue Mizoshiri, Osaka Univ. (Japan); Junji
Nishii, National Institute of Advanced Industrial Science and Technology
(Japan); Yoshinori Hirata, Osaka Univ. (Japan)
Date: Tuesday, 12 August 2008
SiO2-based diffractive/refractive hybrid microlenses were created by use of
femtosecond laser lithography-assisted micromachining (FLAM). Diffractive
optical elements of inorganic materials are expected to be used for optical
interconnection, information appliances, and so on. In this study, we proposed
the FLAM for microfabrication upon nonplanar surfaces such as lens structures,
which was difficult for conventional photolithography technique. By use of
femtosecond laser-induced nonlinear optical absorption, the fine resist patterns
were formed even on nonplanar substrates. We could obtain SiO2 microFresnel lens
upon convex lenses after pattern transfer by plasma. FLAM is one of effective
ways for integrated photonic devices.
Ultrafast diagnostics of energy transfer in photovoltaic
materials (Paper Presentation)
Paper 7047-11 of Conference 7047
Authors(s): Xianfan Xu, Purdue Univ.
Date: Wednesday, 13 August 2008
In this work, we investigate the ultrafast energy conversion process in
photovoltaic materials. We employ a femtosecond laser based technique to excite
coherent optical phonons in nanostructured photovoltaic materials. The
femtosecond time-resolved measurements allow us to determine the energy transfer
process during the photo-excitation process and the energy coupling from
electrons to phonons. By measuring the phonon decay time, we are able to
investigate electron-phonon interaction and phonon-phonon interaction in
details. The possibility of extending the free electron lifetime using
nanostructured materials, which is one of the approaches for increasing the
efficiency of the photovoltaic materials is also investigated.
Near-IR enhanced position-sensitive avalanche photodiodes (Paper
Presentation)
Paper 7055B-20 of Conference 7055B
Authors(s): Richard A. Myers, Richard Farrell, Frank Robertson, Radiation
Monitoring Devices, Inc.; James E. Carey, SiOnyx Inc.; Eric Mazur, Harvard Univ.
Date: Monday, 11 August 2008
A processing method employing a Ti-sapphire femtosecond laser was used for
microstructure the surface of position-sensitive silicon avalanche photodiodes (PSAPDs)
and enhancing their near-infrared response. Experiments were performed on APDs
using a series of microstructuring parameters and high-temperature annealing
steps. Using the optimized technique, we were able to fabricate APDs with
quantum efficiencies as high as 58% at 1064 nm. This enhanced near-infrared
response has been realized in both lateral effect and quadrant-type PSAPDs
without altering their electronic noise, maximum avalanche gain or position
resolution.
Nonlinear optical properties of neat and DNA-CTMA doped dendritic
chromophores (Paper Presentation)
Paper 7040-9 of Conference 7040
Authors(s): Anna Samoc, Marek J. Samoc, The Australian National Univ.
(Australia); Tzu-Chau Lin, National Central Univ. (Taiwan); Barry Luther-Davies,
The Australian National Univ. (Australia); James G. Grote, Air Force Research
Lab.
Date: Tuesday, 12 August 2008
Negative values of the nonlinear refractive index, Re(n2), related to the real
part of the complex hyperpolarizability gamma, and a strong multi-photon
absorption were observed in a broad spectral range, 520 nm – 1600 nm with the
femtosecond Z-scan technique in a family of dendritic compounds built of
triphenylamine and fluorene units. The studies performed in the deoxyribonucleic
acid - cetyltrimethylammonium complex (DNA-CTMA) doped with the chromophores at
various molar ratios of the DNA base pairs to the dye in the range from 100:1 to
2:1, indicated enhancement of the fluorescence and of the nonlinear optical
response.
Pump probe experiment for light scattering media diagnosis (Paper
Presentation)
Paper 7065-34 of Conference 7065
Authors(s): Marie Barthelemy, Thibault Dartigalongue, Laurent Hespel, Nicolas
Rivière, ONERA (France); Gérard Gréhan, Univ. de Rouen (France)
Date: Tuesday, 12 August 2008
Optical density measurement is a very powerful tool to characterize particle
size and physical property of diffuse media such as jets and engine injection.
The major difficulty of such a measurement is the tremendous amount of diffused
light : for such media, the optical density can be greater than 10. The goal of
this work is to develop a new experimental tool, based on femtosecond laser
technology in order to isolate (spatially and temporally) a very limited amount
of non diffused transmitted light, and to measure the extinction of diffuse
media.
Surface plasmon resonance linear and nonlinear response in a
single metal nanoparticle (Paper Presentation)
Paper 7033-44 of Conference 7033
Authors(s): Hatim Baida, Aurelien Crut, Paolo Maioli, Univ. Claude Bernard Lyon
1 (France); Natalia Del Fatti, Univ Claude Bernard Lyon 1 (France); Fabrice
Vallee, Univ. Claude Bernard Lyon 1 (France)
Date: Wednesday, 13 August 2008
The results of the linear and nonlinear response of a single metal nanoparticle
investigated using the spatial modulation technique combined with ultrafast
femtosecond spectroscopy will be discussed. Quantitative information on the
surface plasmon resonance characteristics in silver nanospheres and on the
optical nonlinearity in single gold nanorods will be presented.
Invited Paper
Nonlinear optical properties of quantum sized gold clusters
(Paper Presentation)
Paper 7049-21 of Conference 7049
Authors(s): Theodore G. Goodson III, Guda Ramakrishna, Univ. of Michigan; Lee
Dongil, Western Michigan Univ.
Date: Thursday, 14 August 2008
Research on gold clusters comprising of few tens to hundreds of atoms has
received great deal of research attention since they bridge the properties of
isolated gold to clusters to nanoparticle and consequent molecule to metal
transition1. Here, we have systematically followed the femtosecond excited state
dynamics and nonlinear optical properties (two-photon absorption, TPA) of gold
clusters comprising of 25 atoms to 140, 309 and all the way up to 2406 atoms in
an attempt to realize such metal to molecule transition.
Avalanche photodiode time-resolved diagnostics for interaction
experiment (Poster Presentation)
Paper 7077-60 of Conference 7077
Authors(s): Josef Blazej, Czech Technical Univ. in Prague (Czech Republic);
Ladislav Pina, Czech Technical Univ. in Prague (Czech Republic) and Reflex s.r.o.
(Czech Republic); Miroslava Vrbova, Alexandr Jancarek, Ivan Prochazka, Czech
Technical Univ. in Prague (Czech Republic)
Date: Monday, 11 August 2008
We have designed, developed and tested the avalanche diode structures
operational as single photon counters with picosecond resolution on the basis of
the GaP material. The preliminary results of interaction experiments with
femtosecond laser and solid state target are presented. Timing resolution of
solid state photon counters as high as 60 picoseconds full width at a half
maximum has been achieved when detecting single photon signals. The advantage of
low operating voltage is discussed. The timing resolution and signal to noise
ration is presented for different detector configuration, using active or
passive quenching circuit.
Fringe-resolved interferometric autocorrelation of ultrashort-pulsed
Bessel-like beams (Paper Presentation)
Paper 7063-36 of Conference 7063
Authors(s): Silke Huferath, Bremer Institut für Angewandte Strahltechnik
(Germany); Volker Kebbel, Bremer Werk fur Montagesysteme (Germany); Martin Bock,
Ruediger Grunwald, Max-Born-Institut für Nichtlineare Optik und
Kurzzeitspektroskopie (Germany)
Date: Tuesday, 12 August 2008
In fringe-resolved noncollinear autocorrelation, ultrashort pulses of interest
are split by an interferometric setup into nearly identical replica which are
superimposed in a certain angle thus enabling a self-referential measurement by
analyzing fringe envelopes. Temporal information is extracted by detecting
higher order autocorrelation functions after frequency conversion. Here we
report on a modified fringe-resolved technique based on analyzing the radial
fringe envelope of Bessel-like beams and beam arrays. In comparison to the
classical method, an appropriate mathematical transform has to be applied.
Experiments with pulse durations in few-femtosecond range were performed.
Plasmonic metamaterials and their applications (Paper
Presentation)
Paper 7033-53 of Conference 7033
Authors(s): Igor I. Smolyaninov, BAE Systems
Date: Wednesday, 13 August 2008
Linear and nonlinear optical properties of two-dimensional plasmonic
metamaterials consisting of alternating layers of metal-vacuum and
metal-dielectric interfaces prepared on different substrates will be discussed.
Imaging and focusing applications of these metamaterials will be presented.
Femtosecond plasmon-induced changes in the magnetic anisotropy of the iron
garnet substrate will be presented. This effect is found to be similar to the
previously reported photo-induced magnetic anisotropy in this material. However,
its dependence on the polarization of the
light and orientation of the magnetization is found to be different and it's
magnitude appears to be enhanced. This plasmonic control of the spins opens new
interesting avenues for all-optical ultrafast control of the magnetization at a
nanometer length scale.
Ultrashort relativistic electron bunches and spatio-temporal
radiation biology (Paper Presentation)
Paper 7080-1 of Conference 7080
Authors(s): Yann A. Gauduel, Jerome Faure, Victor Malka, Ecole Nationale
Supérieure de Techniques Avancées (France)
Date: Thursday, 14 August 2008
The intensive developments of terawatt Ti:Sa lasers have permitted to extend
laser-plasma interactions into the relativistic regime and to provide very-short
particles bunches in the MeV energy range. A combination with femtosecond near-IR
optical pulses might conjecture the real-time investigation of penetrating
radiation effects. This emerging domain involves high-energy radiation
femtochemistry for which the early energy deposition is decisive for the
prediction of cellular and tissular radiation damages. It is shown that short
range electron-biosensor interactions lower than 10 Ă take place in nascent
ionisation tracks. High-quality ultrashort particle beams open opportunities for
spatio-temporal radiation biology, cancer therapy and nanomedicine.
Modulating the optical response of thin-film structures by a
nanoscale phase transition (Paper Presentation)
Paper 7041-17 of Conference 7041
Authors(s): Richard F. Haglund, Jr., Vanderbilt Univ.
Date: Thursday, 14 August 2008
Vanadium dioxide undergoes a reversible semiconductor-to-metal transition (SMT)
near 70˚C, transforming the crystal structure from monoclinic to rutile. The SMT
can be induced either thermally, or by band-to-band laser excitation on a
femtosecond time scale. The hysteresis in the optical reflection or transmission
associated with the SMT exhibits intensity-, size-, shape- and
curvature-dependent effects that open the door to a variety of technological
applications for nanostructured VO2. In composite nanostructures combining VO2
with noble metals, the change in the dielectric function effected by the SMT can
be used to modulate the plasmonic response of noble-metal nanostructures on an
ultrafast time scale.
Nanoparticle-assembled catalysts for solar hydrogen generation
from water (Paper Presentation)
Paper 7044-19 of Conference 7044
Authors(s): Frank E. Osterloh, Univ. of California/Davis
Date: Thursday, 14 August 2008
We present a modular strategy to build photochemical water splitting catalysts
by linkage of CdSe, KCa2Nb3O10, or K4Nb6O17 nanosheets and Pt or IrO2
nanoparticles. The structures are supported by direct covalent bonds or by
aminoalkylsilane linkers. Upon ultraviolet or visible irradiation all composites
are active for photocatalytic hydrogen evolution from water, with the activity
depending on the nature of the linkers and on the components. Femtosecond
absorption spectroscopy and electrochemistry were used to probe charge
generation and transport in these structures and across the nanoparticle-solution
interfaces. The nanostructures were also characterized with electron microscopy,
and visible and fluorescence spectroscopy.
A bio-inspired single photon detector with suppressed noise and
low jitter (Paper Presentation)
Paper 7035-31 of Conference 7035
Authors(s): Omer G. Memis, Alex Katsnelson, Hooman Mohseni, Northwestern Univ.;
Minjun Yan, Shuang Zhang, Tim Hossain, Niu Jin, Ilesanmi Adesida, Univ. of
Illinois at Urbana-Champaign
Date: Thursday, 14 August 2008
A single photon detector for short wave infrared spectrum was conceived. The
detection mechanism is conceptually based on biological inspirations taken from
the eye. The detectors provide internal amplification to achieve gain values
reaching 10,000 with bias voltages around 1 V for imaging applications.
Ultra-low noise levels were measured at gain values exceeding 4,000 at room
temperature. An alternate version of the detector, specialized towards
high-speed applications, was also developed. Fast detectors with bandwidth
beyond 3 GHz were demonstrated which provide gain values around 20. Femtosecond
pulsed illumination measurements exhibited ultra-low jitter around 15 ps,
consistent with statistically stable nature of amplification.
Nanoscale melting and ablation using near-field plasmonic effects
of gold nanorods on silicon (Poster Presentation)
Paper 7032-90 of Conference 7032
Authors(s): Rick K. Harrison, Nick Durr, Adela Ben-Yakar, The Univ. of Texas at
Austin
Date: Wednesday, 13 August 2008
The near-field confinement of femtosecond lasers for material ablation has
potential for applications ranging from nanosurgery to nanolithography. Gold
nanorods have tunable plasmon resonances that can be exploited to achieve large
enhancements of the electromagnetic fields near the particle for ablation on the
nanometer scale. We investigate the near-field enhancement from gold nanorods to
better understand the interaction between laser light and the plasmon
oscillations. We demonstrate the melting of individual gold nanorods and the
ablation of material below nanorods, both of which have been found to be fluence
and orientation dependent. Nanorods and surfaces were observed before and after
irradiation using high-resolution scanning electron and atomic force microscopy.
Gold nanorods were deposited on silicon (100) and irradiated at resonance.
Experiments were performed in air and water environments to observe the effect
of medium on the ablation, particle removal and melting characteristics. In
addition to experimental results, we present simulations of nanorods using
discrete dipole approximation (DDA) and finite-difference time-domain (FDTD)
codes, which are benchmarked using Mie theory for gold spheres. The effect of
substrates on the enhancement has also been studied computationally with a model
including low-density plasma formation with increased absorption. Enhancement
was demonstrated through the observed modification of silicon near gold nanorods
below the unenhanced threshold. This enhancement effect was compared with
predicted values from simulations. We have also studied the polarization
dependence of energy absorption characteristics. Lastly, we estimate the
threshold melting fluence for gold nanorods with experiments and theoretical
predictions.
Micro-optic array applications in terawatt ultrafast laser
amplifiers (Paper Presentation)
Paper 7062-3 of Conference 7062
Authors(s): Barry C. Walker, Isaac Ghebregziabher, Sasi Palaniyappan, Anthony
DiChiara, Univ. of Delaware
Date: Monday, 11 August 2008
Recent developments in micro-optics offer the potential of higher power, more
robust ultrafast laser technology operating at high efficiency. Results using
micro-optic lenslet arrays in an ultrafast, Ti:sapphire terawatt amplifier are
presented. We report a final ultrafast amplified laser mode can be shaped to
within 1% of the target Gaussian at a pump energy to laser pulse energy
conversion efficiency of 35%. Focusing studies demonstrate the laser system with
microlens arrays can achieve a peak intensity of 10^(19) W/cm^2. Future
applications of microlens arrays in 100 terawatt and possibly petawatt peak
power systems will be discussed.
Photonic bandgap and ultrafast lasers: IR photodetectors
phenomenology and novel applications (Paper Presentation)
Paper 7055B-18 of Conference 7055B
Authors(s): Michael K. Rafailov, RICHER International LLC
Date: Monday, 11 August 2008
Unique feature of an ultra-fast laser is its ability to “bleach” of an IR
photodetector for a period of time that proportional to free carrier lifetime
and comparable with detector raise time. Ultra-fast laser “bleaching” capability
opens almost unlimited opportunities in IR photonics novel applications,
especially in defense and military areas. In this paper we will discuss
applications of ultra-fast and, to some extends – fast lasers to Advanced
Directional Laser Based Infrared Countermeasures-IRCM, Laser Low Observables and
military platform signature reduction as well as broader sensing and
counter-sensing capabilities. Presented physical and mathematical models of the
interaction process helps expand qualified laser pulse dwell time to pico-second
and, to some extends, to nano-second pulse range.
Ultrafast optical switching and laser dynamics in distributed
feedback polymer lasers (Paper Presentation)
Paper 7051-47 of Conference 7051
Authors(s): Stefano Perissinotto, Margherita Zavelani-Rossi, Marco Carvelli,
Guglielmo Lanzani, Politecnico di Milano (Italy); Marco Salerno, Instituto
Italiano di Tecnologia (Italy); Giuseppe Gigli, Univ. degli Studi di Lecce
(Italy)
Date: Tuesday, 12 August 2008
In this work the photon-exciton and laser dynamics of organic distributed
feedback lasers are investigated by applying the pump-probe technique to devices
under operation [1].
Moreover we demonstrate a range of modulation techniques, including optical
gating and two photon pumping . We mainly show all optical control of the laser
by applying a gating pulse, which completely switch-off emission in the sub-ps
time scale and may represent a possible way for integration of organic photonics
. The switching mechanism is assigned to photo-injection of charge carriers
induced by the gate transition [2].
[1] M. Zavelani-Rossi, S. Perissinotto, G. Lanzani, M. Salerno, G. Gigli, Appl.
Phys. Lett. 89, 181105 (2006).
[2] S. Perissinotto, G. Lanzani, M. Zavelani-Rossi, M.Salerno, G. Gigli, Appl.
Phys. Lett. 91, 191108 (2007).
Ultrafast optical switching and laser dynamics in distributed
feedback polymer lasers (Paper Presentation)
Paper 7049-47 of Conference 7049
Authors(s): Stefano Perissinotto, Margherita Zavelani-Rossi, Marco Carvelli,
Guglielmo Lanzani, Politecnico di Milano (Italy); Marco Salerno, Instituto
Italiano di Tecnologia (Italy); Giuseppe Gigli, Univ. degli Studi di Lecce
(Italy)
Date: Tuesday, 12 August 2008
In this work the photon-exciton and laser dynamics of organic distributed
feedback lasers are investigated by applying the pump-probe technique to devices
under operation [1].
Moreover we demonstrate a range of modulation techniques, including optical
gating and two photon pumping . We mainly show all optical control of the laser
by applying a gating pulse, which completely switch-off emission in the sub-ps
time scale and may represent a possible way for integration of organic photonics
. The switching mechanism is assigned to photo-injection of charge carriers
induced by the gate transition [2].
[1] M. Zavelani-Rossi, S. Perissinotto, G. Lanzani, M. Salerno, G. Gigli, Appl.
Phys. Lett. 89, 181105 (2006).
[2] S. Perissinotto, G. Lanzani, M. Zavelani-Rossi, M.Salerno, G. Gigli, Appl.
Phys. Lett. 91, 191108 (2007).
Recent advances on multiple channel unequally spaced optical
phased array for ultrafast LADAR (Poster Presentation)
Paper 7056-47 of Conference 7056
Authors(s): Shizhuo Yin, Jae Hun Kim, The Pennsylvania State Univ.; Paul B.
Ruffin, Eugene Edwards, Christina L. Brantley, U.S. Army Aviation and Missile
Research, Development and Engineering Ctr.; Claire Luo, General Opto Solutions,
LLC
Date: Tuesday, 12 August 2008
In this paper, we review the recent advance on our research project related to
the unequally spaced multiple channel optical phased array. It clearly shows
that as the number of channels increases,the angular width of the main lobe
becomes narrower and narrower. Furthermore, the level of the side grating lobes
also decreases significantly. Thus,highly accurate, ultrafast tuning speed beam
scanning can be realized by employing multiple channel unequally spaced optical
phased array, which can be very useful for the high performance next generation
LADAR.
A two-pass Sagnac loop for high-contrast ultrafast switching at
1053nm (Paper Presentation)
Paper 7072-38 of Conference 7072
Authors(s): Alain Jolly, Sébastien Jonathas, Commissariat à l'Energie Atomique
(France); Jacques Luce, Commissariat a l'Energie Atomique (France); Herve Coic,
Jean-François Gleyze, Commissariat à l'Energie Atomique (France); Sophie
Letourneur, Patrice Le Boudec, IDIL Fibres Optiques (France)
Date: Wednesday, 13 August 2008
We demonstrate a fully polarization - maintaining Sagnac setup, for gating
applications in the range of laser wavelengths of interest for ICF needs. Our
design involves two propagation paths with two highly different wavelengths,
i.e. 1053nm for the signal and 1550nm for switching. The optical architecture is
operated using properly controlled nonlinear effects within a unique Sagnac
loop. The sub - picosecond synchronization of the two propagation paths helps to
compensate for any unwanted depolarization effect and manage the switching
issues within a wide range of signal bandwidths. A comprehensive model is
proposed to discuss the optical performance.
Ultrafast diagnostics of energy transfer in photovoltaic
materials (Paper Presentation)
Paper 7047-11 of Conference 7047
Authors(s): Xianfan Xu, Purdue Univ.
Date: Wednesday, 13 August 2008
In this work, we investigate the ultrafast energy conversion process in
photovoltaic materials. We employ a femtosecond laser based technique to excite
coherent optical phonons in nanostructured photovoltaic materials. The
femtosecond time-resolved measurements allow us to determine the energy transfer
process during the photo-excitation process and the energy coupling from
electrons to phonons. By measuring the phonon decay time, we are able to
investigate electron-phonon interaction and phonon-phonon interaction in
details. The possibility of extending the free electron lifetime using
nanostructured materials, which is one of the approaches for increasing the
efficiency of the photovoltaic materials is also investigated.
Ultrafast adaptive optical near-field control in nanoplasmonic
(Paper Presentation)
Paper 7032-58 of Conference 7032
Authors(s): Martin Aeschlimann, Univ. Kaiserslautern (Germany)
Date: Wednesday, 13 August 2008
The optical response of nanostructures exhibits fascinating properties, such as
subwavelength variation of the field, local field enhancement, and local fields
with vector components perpendicular to those of the incident field. Moreover,
the combination of ultrafast laser spectroscopy, i.e. illumination with
broadband coherent light sources, and near-field optics opens a new realm for
nonlinear optics on the nanoscale. First experiments demonstrating the
manipulation of nanoscopic local near-fields on sub-diffraction length scales by
the use of a coherent control scheme on a ultrafast time scale will be
presented. Silver nanoparticles manufactured by e-beam lithography are
illuminated with ultrashort polarization shaped laser pulses. The induced local
near-field distribution is mapped by the two-photon photoemission pattern as
recorded using a photoemission electron microscope (PEEM). The observed emission
pattern critically depends on the polarization state of the incident laser
pulse. Furthermore, it is demonstrated that adaptive polarization pulse shaping
allows optimizing a particular emission pattern with sub-diffraction resolution.
First spatio-temporal control experiments will be shown.
Ultrafast local investigations of plasmonic structures (Paper
Presentation)
Paper 7032-59 of Conference 7032
Authors(s): Laurens Kuipers, FOM Institute for Atomic and Molecular Physics
(Netherlands)
Date: Wednesday, 13 August 2008
Both plasmonic and periodic structures can exert a huge control over
electromagnetic waves at the nanoscale. The result may be slow light in photonic
crystal waveguides or huge field enhancements near metal nanostructures. With
plasmonic crystals we gain the best of both worlds. Visualization of the
propagation with subwavelength resolution allows the optical properties to be
unravelled in detail. With a time-resolved near-field microscope we have tracked
plasmonic wavepackets (duration 100 fs) as they propagate. We show that plasmons
in periodic structures obey Bloch's theorem. Moreover, we can slow the
wavepackets down for their entire bandwidth (~4 THz).
Optics of photonic band gap crystals: Spontaneous emission
control and ultrafast switching (Paper Presentation)
Paper 7031-10 of Conference 7031
Authors(s): Willem Vos, Univ. Twente (Netherlands) and FOM Institute for Atomic
and Molecular Physics (Netherlands)
Date: Thursday, 14 August 2008
I will discuss latest results on nano-fabrication, spontaneous emission control,
and ultrafast switching. We have systematically studied quantum efficiency and
oscillator strength of semiconductor quantum dots. The results shed new light on
the electron and hole wavefunction overlap. We observe modified spontaneous
emission in 3D photonic crystals with new phenomena on quantum dots, laser dyes,
and even biological emitters.
To switch semiconductor photonic crystal structures, we homogeneously excite the
systems by two-photon processes. We observe intricate behavior due to competing
electronic Kerr and free-carriers effects. We observe ultrafast changes of
cavity resonances and quality factors. Possible applications will be assessed.
Light-activated ultrafast magneto-optic switches (Paper
Presentation)
Paper 7056-28 of Conference 7056
Authors(s): Shizhuo Yin, Chia-En Yang, Meng-Ku Chen, The Pennsylvania State
Univ.
Date: Thursday, 14 August 2008
In this paper, we present our recent work on light activated ultrafast
magneto-optic switch by integrating the ultrafast magneto-optic switch with a
linear photoconductive switch. The experimental result demonstrats that a ns
range switching speed can be achieved. Furthermore, the delay time between the
light activation and the optical switching time is in the sub-ns range.
Ultrafast pulse characterization using XPM in silicon (Paper
Presentation)
Paper 7056-39 of Conference 7056
Authors(s): Nuh S. Yuksek, Xinzhu Sang, En-Kuang Tien, Qi Song, Feng Qian, Ivan
V. Tomov, Ozdal Boyraz, Univ. of California/Irvine
Date: Thursday, 14 August 2008
High intrinsic nonlinearity enhanced by the tight modal confinement make Silicon
an ideal platform for chip scale nonlinear optical applications. Based on the
cross-phase modulation (XPM) of chirped supercontinuum (SC) pulses by short
pulses, we show that pulse profiles in time domain can be mapped into spectral
domain in a chip scale. Experimentally we measure 2.4ps pulses by mapping them
into spectral domain by using a linearly-chirped SC pulse and a 1.7 cm Silicon
chip. Due to time wavelength mapping, this phenomenon can be utilized to
characterize amplitude and phase information of short pulses in real time.
Development of ultrafast laser-based x-ray in vivo phase-contrast
micro-CT beamline for biomedical applications at Advanced Laser Light Source
(ALLS) (Paper Presentation)
Paper 7078-43 of Conference 7078
Authors(s): Russell E. Kincaid, Syracuse Univ.; Andrzej Krol, Upstate Medical
Univ./SUNY and Syracuse University; Jean-Claude Kieffer, Marina Servol, Univ. du
Québec (Canada); Levon Vogelsang, Syracuse Univ.; Sylvain Fourmaux, Univ. du
Québec (Canada); Stephen W. Wilkins, Andrew W. Stevenson, Timur E. Gureyev,
Yakov I. Nesterets, Commonwealth Scientific and Industrial Research Organisation
(Australia); Edward D. Lipson, Syracuse University and Upstate Medical Univ./SUNY;
Hongwei Ye, Syracuse Univ.; Andrew Pogany, Commonwealth Scientific and
Industrial Research Organisation (Australia)
Date: Thursday, 14 August 2008
We are developing in vivo, in-line holography, x-ray phase-contrast micro-CT
with an ultrafast laser-based x-ray source. This will exceed the capabilities of
conventional micro-CT, by offering superior contrast resolution and multienergy
imaging. Tomographic data were acquired for phantoms and euthanized mouse in two
imaging geometries, with magnification M = 1.28 and 2.05. Images were compared
to those acquired using a commercial micro-CT scanner. The major obstacle to
date is long-term instability in x-ray production by ultrafast laser. We are
working towards stable, ultrafast laser-produced, x-ray generation to enable
fast, high-resolution, in vivo scans.
An investigation of the ultrafast electron transfer between
oligothiophenes and thieno[3,4-b]thiophene units (Paper Presentation)
Paper 7034-2 of Conference 7034
Authors(s): Jodi M. Szarko, Northwestern Univ. and Argonne National Lab.;
Jianchang Guo, Argonne National Lab. and University of Chicago; Yongye Liang,
Luping Yu, The Univ. of Chicago; Lin X. Chen, Northwestern Univ. and Argonne
National Lab.
Date: Monday, 11 August 2008
A new copolymer system based on alkyl oligothiophene/thieno[3,4-b]thiophene
blocks in random sequences has shown the potential for creating more efficient
photovoltaic (OPV) solar cells. We studied both the ultra-fast interactions
between these two monomeric units when they are linked in the copolymers and
their interactions with the electron acceptor PCBM in order to determine the
transport mechanisms in these systems. Three oligomeric molecules have been
synthesized to model the local interactions in the polymers. By performing
transient absorption and up-conversion measurements, the nature of the early
electron transfer and transport between these different units is elucidated.
Interfacial charge carrier dynamics and excitation transport in a
photovoltaic polymer blend observed with ultrafast vibrational spectroscopy
(Paper Presentation)
Paper 7034-3 of Conference 7034
Authors(s): John B. Asbury, Ryan D. Pensack, Larry W. Barbour, Maureen Hegadorn,
The Pennsylvania State Univ.
Date: Monday, 11 August 2008
The dynamics of photoinduced charge separation are examined in a polymer blend
photovoltaic material with ultrafast two-dimensional infrared and visible pump –
infrared probe spectroscopy. The carbonyl (C=O) stretch of PCBM is probed as a
local vibrational reporter of the dynamics in a blend with a conjugated polymer,
CN-MEH-PPV. Following interfacial electron transfer, geminate electron – hole
pair dissociation occurs on ultrafast timescales from 100 fs to 100 ps. Geminate
charge recombination is also observed within a 100 ps window. Interfacial
electron transfer continues on the 100 ps to 3 ns timescales as excitations in
the polymer diffuse to the PCBM interfaces.
Optical pulse shaping and applications (Paper Presentation)
Paper 7062-6 of Conference 7062
Authors(s): Andrew M. Weiner, Purdue Univ.
Date: Monday, 11 August 2008
Femtosecond optical pulse shaping is by now an established technology allowing
generation of essentially arbitrary ultrafast optical waveforms according to
user specification. Waveform generation is accomplished via a Fourier synthesis
method, which reflects phase, amplitude, and polarization information placed
onto the optical spectrum via a spatial light modulator. Applications span
lightwave communications, coherent control of quantum mechanical processes, few
femtosecond pulse compression, nonlinear optical microscopy, and microwave
photonics. In this talk I will first discuss the basics of pulse shaping and
then survey recent topics of interest within my group at Purdue University.
Surface plasmon resonance linear and nonlinear response in a
single metal nanoparticle (Paper Presentation)
Paper 7033-44 of Conference 7033
Authors(s): Hatim Baida, Aurelien Crut, Paolo Maioli, Univ. Claude Bernard Lyon
1 (France); Natalia Del Fatti, Univ Claude Bernard Lyon 1 (France); Fabrice
Vallee, Univ. Claude Bernard Lyon 1 (France)
Date: Wednesday, 13 August 2008
The results of the linear and nonlinear response of a single metal nanoparticle
investigated using the spatial modulation technique combined with ultrafast
femtosecond spectroscopy will be discussed. Quantitative information on the
surface plasmon resonance characteristics in silver nanospheres and on the
optical nonlinearity in single gold nanorods will be presented.
Invited Paper
Dynamics on the nanoscale: time-domain ab initio studies of
quantum dots and carbon nanotubes (Paper Presentation)
Paper 7044-13 of Conference 7044
Authors(s): Oleg V. Prezhdo, Univ. of Washington
Date: Wednesday, 13 August 2008
Harvesting and applications of solar energy requires an understanding of the
dynamical response of novel materials on the nanometer scale. We have developed
state-of-the-art non-adiabatic molecular dynamics techniques and implemented
them within time-dependent density functional theory in order to model the
ultrafast photoinduced processes in these materials at the atomistic level, and
in real time. The talk will focus on the photo-initiated charge transfer at the
molecule-semiconductor interfaces and multiple excitons which can be generated
in semiconductor quantum dots in competition with various relaxation processes.
Attosecond nanoplasmonic field microscope (Paper Presentation)
Paper 7033-12 of Conference 7033
Authors(s): Mark I. Stockman, Georgia State Univ.; Matthias F. Kling,
Max-Planck-Institut für Quantenoptik (Germany); Ulf Kleineberg, Ludwig-Maximilians-Univ.
München (Germany); Ferenc Krausz, Max-Planck-Institut für Quantenoptik (Germany)
Date: Sunday, 10 August 2008
Recently, there has been an increased attention and rapid development in the
field of nanoscale collective electronic dynamics on surfaces of metal
nanostructures, which is due to excitations called surface plasmons. Due to
their broad spectral bandwidth, the surface plasmons possess ultrafast dynamics,
with times as short as a few hundreds attoseconds. The associated spatio-temporal
dynamics of the local optical fields in nanoplasmonic systems so far has been
hidden from direct (in the real space and time domain) access. The concept
presented in this talk will provide the direct, non-invasive access to the
nanoplasmonic collective dynamics with nanometer spatial resolution and ~100 as
temporal resolution. This approach combines two modern techniques, photoelectron
emission microscopy and attosecond streaking spectroscopy. It can be used in
fundamental nanoplasmonics and its various existing and potential applications.
Modeling photoinduced reaction dynamics and coherent control in
sensitized semiconductor surfaces (Paper Presentation)
Paper 7034-11 of Conference 7034
Authors(s): Victor S. Batista, Yale Univ.
Date: Monday, 11 August 2008
Recent studies of semiconductor surfaces, functionalized with organic and
inorganic molecules, will be presented. The first half of the talk will address
the problem of visible-light sensitization of TiO2 surfaces, covalently modified
with Mn complexes suitable for water splitting. The undelying activation of
surface catalyst by ultrafast interfacial electron transfer will be discussed at
the detailed molecular level. The second half of the talk will describe the
feasibility of using sequences of unitary laser pulses for coherent control of
superexchange electronic tunneling in sensitized TiO2 surfaces. The reported
results are particularly relevant for understanding coherent optical
manipulation of electronic excitations in semiconductor devices where
performance can be limited by quantum tunneling and decoherence.
Colloidal quantum dot doped core photonic crystal fibers (Paper
Presentation)
Paper 7030-23 of Conference 7030
Authors(s): Gilberto J. Jacob V.D.M., Diogo D. Almeida, Enver F. Chillcce,
Wagner M. Faustino, André A. de Thomaz, Eugenio Rodriguez, Luiz C. Barbosa,
Carlos L. Cesar, Univ. Estadual de Campinas (Brazil)
Date: Tuesday, 12 August 2008
Quantum Dot [QD] doped optical fibers have attracted much attention due to their
huge potential for the development of a broad class of photonic devices, from
ultrafast optical switching to biosensors. The long optical path in optical
fibers can enhance the quantum dot optical properties by several orders of
magnitude compared to bulk devices or even to short waveguide structures. In the
past we have been able to produce PbTe quantum dot doped core and undoped clad
tellurite glass optical fibers after an enormous effort to match the
thermo-physical and the optical properties of both glasses. We then decided to
go for tellurite glass photonic crystal fiber because we could use the same
glass for core and cladding to avoid the thermophysical mismatch.
Exciton dynamics in self-assembled molecular nanotubes and near
dielectric nanorods (Paper Presentation)
Paper 7034-15 of Conference 7034
Authors(s): Jasper Knoester, Univ. of Groningen (Netherlands)
Date: Tuesday, 12 August 2008
Recent advances in molecular synthesis have enabled the creation of
self-assembled double-wall molecular nanotubes, in which the primary optical
excitations are Frenkel excitons. These tubes may act as artificial
light-harvesting systems. Optical experiments reveal intriguing phenomena, such
as ultrafast energy transport between both walls, color-dependent nonexponential
fluorescence decay, and a dynamic Stokes shift. We show that these properties
may be understood at a quantitative level by using a theory that includes weak
exciton-vibration coupling. I will also address theoretically how exciton
transport between two molecules (Förster transfer) may be focused by placing
both molecules near a dielectric nanorod.
Plasmonic metamaterials and their applications (Paper
Presentation)
Paper 7033-53 of Conference 7033
Authors(s): Igor I. Smolyaninov, BAE Systems
Date: Wednesday, 13 August 2008
Linear and nonlinear optical properties of two-dimensional plasmonic
metamaterials consisting of alternating layers of metal-vacuum and
metal-dielectric interfaces prepared on different substrates will be discussed.
Imaging and focusing applications of these metamaterials will be presented.
Femtosecond plasmon-induced changes in the magnetic anisotropy of the iron
garnet substrate will be presented. This effect is found to be similar to the
previously reported photo-induced magnetic anisotropy in this material. However,
its dependence on the polarization of the
light and orientation of the magnetization is found to be different and it's
magnitude appears to be enhanced. This plasmonic control of the spins opens new
interesting avenues for all-optical ultrafast control of the magnetization at a
nanometer length scale.
Femtosecond micro- and nano-machining of materials for
microfluidic applications (Paper Presentation)
Paper 7039-18 of Conference 7039
Authors(s): Yelena V. White, Matthew Parrish, Xiaoxuan Li, Lloyd Davis, William
Hofmeister, Univ. of Tennessee Space Institute
Date: Wednesday, 13 August 2008
Modulating the optical response of thin-film structures by a
nanoscale phase transition (Paper Presentation)
Paper 7041-17 of Conference 7041
Authors(s): Richard F. Haglund, Jr., Vanderbilt Univ.
Date: Thursday, 14 August 2008
Vanadium dioxide undergoes a reversible semiconductor-to-metal transition (SMT)
near 70˚C, transforming the crystal structure from monoclinic to rutile. The SMT
can be induced either thermally, or by band-to-band laser excitation on a
femtosecond time scale. The hysteresis in the optical reflection or transmission
associated with the SMT exhibits intensity-, size-, shape- and
curvature-dependent effects that open the door to a variety of technological
applications for nanostructured VO2. In composite nanostructures combining VO2
with noble metals, the change in the dielectric function effected by the SMT can
be used to modulate the plasmonic response of noble-metal nanostructures on an
ultrafast time scale.
Linear and nonlinear optical properties of highly transmissive
one-dimensional metal-organic photonic bandgap structures (Paper Presentation)
Paper 7049-24 of Conference 7049
Authors(s): Canek Fuentes-Hernandez, Georgia Institute of Technology; Lazaro A.
Padilha, College of Optics & Photonics/Univ. of Central Florida; Daniel Owens,
Shuo-Yen Tseng, Georgia Institute of Technology; Scott Webster, College of
Optics & Photonics/Univ. of Central Florida; Jian-Yang Cho, Georgia Institute of
Technology; David J. Hagan, Eric W. VanStryland, College of Optics &
Photonics/Univ. of Central Florida; Seth R. Marder, Bernard Kippelen, Georgia
Institute of Technology
Date: Thursday, 14 August 2008
Related Del Mar Photonics products
Femtosecond Lasers - Reserve a spot in our femtosecond Ti:Sapphire training workshop during this summer in San Diego, California
Trestles femtosecond Ti:Sapphire laser
Trestles Finesse femtosecond
Ti:Sapphire laser with integrated DPSS pump laser
Teahupoo Rider femtosecond amplified
Ti:Sapphire laser
Mavericks femtosecond
Cr:Forsterite laser
Tamarack femtosecond fiber laser (Er-doped
fiber)
Buccaneer femtosecond OA fiber laser (Er-doped
fiber) and SHG
Cannon Ultra-broadband light source
Tourmaline femtosecond Yt-doped fiber laser
Chata femtosecond Cr:ZnSe laser (2.5 micron) coming soon
Phonics West 2008: applications of femtosecond
lasers
High Power Femtosecond Laser Systems - Reserve a spot in our femtosecond Ti:Sapphire training workshop during this summer in San Diego, California
Cortes 800 tabletop 40 TW
Ti:Sapphire laser system
Cortes E - High vacuum
laser ablation/deposition system with 2 TW Ti:Sapphire laser
Cortes K - femtosecond seed laser
for Petawatt KrF excimer laser
Cortes O 200TW femtosecond laser - KD*P CPOPA based
amplifier system
Jaws femtosecond Cr:forsterite
Multi-Terawatt Amplified Laser
High-vacuum system for laser
ablation/deposition
Femtosecond pulse measurement instrumentation - Reserve a spot in our femtosecond Ti:Sapphire training workshop during this summer in San Diego, California
Reef scanning and single shot
femtosecond autocorrelators
Avoca SPIDER -
Spectral phase interferometry for direct electric-field reconstruction (SPIDER)
Rincon third order femtosecond
cross-correlator (third order autocorrelator TOAC) also referred to as
contrastmeter
Ultrafast Dynamics Research Tools - Reserve a spot in our Ultrafast Dynamics Tools training workshop during this summer in San Diego, California
Beacon femtosecond fluorescence
up-conversion (optical gating) spectrometer
Hatteras Ultrafast Transient
Absorption Spectrometer
Femtosecond Systems and Accessories - Reserve a spot in our femtosecond Ti:Sapphire training workshop during this summer in San Diego, California
Femtosecond Micromachining
Femtosecond nanophotonics
Femtosecond NSOM
Pacifica femtosecond fiber laser based
terahertz spectrometer
Pismo pulse picker (ultrafast
electro-optical shutter)
Wavelength conversion:
second and third harmonics generators for femtosecond lasers
Jibe white light continuum generator
Kirra Optical Faraday Rotators and
Isolators
Laser accessories
Diffractive Variable Attenuator for high power lasers
Deformable mirrors - active
elements for adaptive optics systems - Reserve a spot in our
Adaptive optics and wavefront sensors
workshop in San Diego
ShaH - the family of fast,
accurate and reliable wavefront sensors
Complete adaptive optics systems
Faraday rotators and isolators for high-power
(up to 1kW) laser beams
SAM - Saturable Absorber Mirrors
PCA - Photoconductive antenna for terahertz
applications