NDLI: Terahertz excitation dynamics in semiconductor heterostructures

Content Provider	IEEE Xplore Digital Library
Author	Kersting, R.
Copyright Year	2002
Description	Author affiliation: Dept. of Phys., Rensselaer Polytech. Inst., Troy, NY, USA (Kersting, R.)
Abstract	Summary form only given. The advent of terahertz time-domain spectroscopy (THz-TDS) gave research on intersubband dynamics a new dimension of time resolution. THz-TDS allows the measurement of a transient polarization with subcycle time resolution thus providing full information on the intersubband response to ultrafast and nonadiabatic excitation pulses. We have investigated the dynamics of intersubband excitations in modulation n-doped AlGaAs/GaAs heterostructures. Their parabolically shaped conduction band leads to equally spaced intersubband transitions, which have typical resonance frequencies between 1.5 THz and 3.0 THz. The quantum wells are modulation n-doped at about 10/sup 12/ cm/sup -2/ and have electron mobilities of about 80,000 cm/sup 2//Vs, which correspond to dephasing times of about 2 ps. The electron density in the quantum wells can be controlled electronically by Schottky grating contacts fabricated on top of the structures. In our time-resolved experiments we excite the intersubband transitions with few-cycle THz pulses. Switching the electron density within the devices gives a modulation signal, which directly shows the polarization of the electronic quantum transitions. The polarization build-up and the free induction decay are observed on nonadiabatic time-scales. The results are compared to solutions of the optical Bloch equations. In order to follow the nonadiabatic dynamics our model uses an ansatz, which goes beyond the slowly-varying envelope approximation and unveils the population dynamics at low excitation densities. As a first application for signal processing we present a THz phase modulator device.
Sponsorship	IEEE/Lasers & Electro-Opt. Soc. OSA-Opt. Soc. America Quantum Electron. Div. Eur. Phys. Soc. Opt. Soc. Japanese Quantum Electron. Joint Group
Starting Page	662
Ending Page	663
File Size	283917
Page Count	2
File Format	PDF
ISBN	1557527067
DOI	10.1109/CLEO.2002.1034453
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-05-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Optical Soc. of America
Subject Keyword	Spectroscopy Optical polarization Pulse measurements Gallium arsenide Resonant frequency Time domain analysis Time measurement Resonance Optical signal processing Electrons
Content Type	Text
Resource Type	Article

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