Del Mar Photonics features customer: Professor James Heyman, Macalester College
The PCA detector will be used in Macalester College Professor James Heyman's laboratory for ultrafast THz spectroscopy. Heyman primarily studies electron dynamics in semiconductors and semiconductor heterostructures. Research is conducted with Macalester undergraduates, providing these students with important training in research techniques in Physics and Photonics. There is little barrier between research and teaching at a liberal arts college like Macalester, and Heyman's ultrafast THz lab is also used for demonstrations and instructional labs in the courses Modern Physics, Optics and Electromagnetic Theory.
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Del Mar Photonics - PCA brochure - buy online - PCA Q&A
Professor of Physics and Chair
Ph.D., University of California at Berkeley, 1992
James Heyman is interested in experimental condensed matter physics and ultrafast laser spectroscopy. Students regularly collaborate with him in his NSF-funded research on ultrafast processes in semiconductors and the generation of picosecond pulses of electromagnetic radiation.
We use ultrafast optical techniques to investigate carrier transport and hot-carrier effects in semiconductors and semiconductor quantum wells. Our principle experimental technique is ultrafast THz spectroscopy, which lets us impulsively excite a material with a femtosecond optical pulse or single-cycle electromagnetic pulse, and record the resulting motion of charge in time. This allows us to investigate charge transport and observe hot-carrier phenomena in semiconductors and semiconductor heterostructures on time-scales that will be relevant to future electronic devices.
Papers (for complete list go here)
J. N. Heyman, D. Bell*, T. Khumalo*, "Terahertz Photo-Hall Measurements of Carrier Mobility in GaAs and InP". Applied Physics Letters 88 (2006): 162104.
J. N. Heyman,
N. Coates* , A. Reinhardt *, and G. Strasser, "Diffusion and Drift in Terahertz
Emission at GaAs Surfaces". Applied Physics Letters 83 (2003): 5476.
J. N. Heyman, P. Neocleous*, D. Hebert*, P.A. Crowell, T. Müller, K. Unterrainer, “Terahertz emission from GaAs and InAs in a Magnetic Field” Physical Review B64, (2001) 085202.
J. N. Heyman,
R. Kersting, K. Unterrainer. “Time-Domain Measurement of Intersubband
Oscillations in a Quantum Well” Applied Physics Letters 72 (Feb. 1998): 644-646.
J. N. Heyman, J. Barnhorst*, K. Unterrainer, J. Williams, K. Campman, P.F.Hopkins, A.C.Gossard. “Intersubband scattering of cold electrons in a coupled quantum well with subband spacing below the optical phonon energy .” Physica E 2 (1998): 195-199.
J. N. Heyman, H. Wragea, C. Linda, D. Heberta, P.
Neocleousa, P.A. Crowell, T. Müllerc, K. Unterrainer. Terahertz Emission From
Magneto-plasma Oscillations in Semiconductors.
Ultrafast terahertz spectroscopy can be used to probe charge and spin dynamics in semiconductors. We have studied THz emission from bulk InAs and GaAs and from GaAs/AlGaAs quantum wells as a function of magnetic field. Ultrashort pulses of THz radiation were produced at semiconductor surfaces by photoexcitation with a femtosecond Ti- Sapphire laser, and we recorded the THz emission spectrum and the integrated THz power as a function of magnetic field and temperature. In bulk samples the emitted radiation is produced by coupled cyclotron-plasma oscillations: we model THz emission from n-GaAs as magneto-plasma oscillations in a 3-D electron gas. THz emission from a modulation-doped parabolic quantum well is described in terms of coupled intersubband-cyclotron motion. A model including both 3-D plasma oscillations and a 2-D electron gas in a surface accumulation layer is required to describe THz emission from InAs in a magnetic field.
keywords: terahertz, ultrafast, InAs, GaAs, plasmon, magnetic, parabolic quantum well
Del Mar Photonics products related to ultrafast optical techniques and THZ spectroscopy:
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laser - Trestles 50 Manual
Trestles 20 Manual - 20/50/100 fs oscillators - FemtoStart
Trestles Finesse Ti:Sapphire oscillator - Q&A - LQ
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Tamarack Femtosecond Er-doped fiber laser
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Buccaneer Er-doped Femtosecond OA Fiber Laser (1560nm)
Buccaneer SHG (780nm) femtosecond fiber lasers
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Hatteras Ultrafast Transient
Beacon Femtosecond Fluorescence Up-conversion Spectrometer
Femtosecond NSOM Ultrafast Near field Optical Microscope
JIBE White Light Continuum Generator
Complete Ultrafast Dynamics System - fs
Femtosecond Harmonic Generators
Kirra Faraday Optical Rotators and
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Pismo Pulse Pickers: Electro-Optical
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Pacifica Terahertz Spectrometer
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Saturable Absorption Mirrors (SAM) - (pdf) buy online - RSAM
Photoconductive Antenna (PCA) for Terahertz
PCA models - Q&A - buy online
|Terahertz Spectroscopy: Principles and Applications (Optical
Science and Engineering) ~ Susan L. Dexheimer
of new sources and methods in the terahertz spectral range has generated
intense interest in terahertz spectroscopy and its application in an array
of fields. Presenting state-of-the-art terahertz spectroscopic techniques,
Terahertz Spectroscopy: Principles and Applications focuses on time-domain
methods based on femtosecond laser sources and important recent applications
in physics, materials science, chemistry, and biomedicine.
Principles of Terahertz Science and Technology (Lecture Notes in Physics) ~ Yun-Shik Lee
Principles of Terahertz
Science and Technology aims to elucidate the fundamentals of THz technology
and science for potential new users. It surveys major techniques of
generating, detecting, and manipulating THz waves and also discusses a
number of essential processes where THz waves interact with physical,
chemical, and biological systems. This book serves as an introduction to THz
technology for new researchers in various fields.
Terahertz Science And Technology For Military And Security Applications (Selected Topics in Electronics and Systems) ~ Dwight L. Woolard
The inherent advantages and potential payoffs of the
terahertz (THz) regime for military and security applications serve as an
important driver for interest in new THz-related science and technology. In
particular, the very rapid growth in more recent years is arguably most
closely linked to the potential payoffs of THz sensing and imaging
|Terahertz Optoelectronics ~ Sakai, Kiyomi
The book presents recent and important developments in the field of terahertz radiation with a particular focus on pulsed terahertz radiation. Situated in the gap between electronics and optics, the terahertz frequency range of the electro-magnetic spectrum has long been neglected by scientists and engineers due to a lack of efficient and affordable terahertz sources and detectors. The advent of femtosecond lasers in the 1980s and photoconductive switches in 1984 have made the terahertz gap accessible, while at the same time advances in electronics and optics have made it narrower. Research activities in terahertz frequencies have risen dramatically since that time, funding has increased by a factor of 100 in the last decade. The reviews by leading experts are of interest to researchers and engineers as well as advanced students.
|Intense Terahertz Excitation of Semiconductors ~ S. G.
Product DescriptionIntense Terahertz Excitation of
Semiconductors presents the first comprehensive treatment of high-power
terahertz applications to semiconductors and low-dimensional semiconductor
structures. Terahertz properties of semiconductors are in the center of
scientific activities because of the need of high-speed electronics. This
research monograph bridges the gap between microwave physics and photonics.
It focuses on a core topic of semiconductor physics providing a full
description of the state of the art of the field.
Terahertz Frequency Detection and Identification of Materials and Objects ~ R.E. Miles
Terahertz frequency sensing has
a unique part to play in the detection and identification of materials and
objects. This frequency range, corresponding to a wavelength of around 0.1
mm, can be used to identify materials from their molecular spectra and to
produce images of concealed objects. Terahertz spectra of drugs of abuse and
explosives presented by a number of the contributing authors show that the
presence of these materials can be detected in envelopes, packages and