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Proceedings Paper

Surface-acoustic-wave based quantum-well photodetectors
Author(s): D. H. Huang; G. Gumbs; M. Pepper
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Paper Abstract

We develop a dual-charged-fluid model is to explore the surface-acoustic-wave (SAW) dragged photocurrents of one-dimensional (1D) confined-state carriers in a steady state. The proposed model takes into account the quantum confi;nement, the tunneling escape of SAW-dragged 1D carriers, the inelastic capture of two-dimensional continuous-state carriers and the induced self-consistent space-charge field. The numerical results demonstrate a high optical gain due to suppressed recombination of 1D carriers in a region between an absorption strip and a surface gate. Using a discrete model, we calculate the responsivity for the SAW-dragged photocurrent in a quantum well as functions of the gate voltage, photon flux, SAW power and frequency and temperature, respectively. A high responsivity (~103 Amp/Watt) is shown for high gate voltages and SAW powers, as well as for low photon fluxes and SAW frequencies.

Paper Details

Date Published: 26 August 2008
PDF: 15 pages
Proc. SPIE 7095, Nanophotonics and Macrophotonics for Space Environments II, 70950I (26 August 2008); doi: 10.1117/12.793840
Show Author Affiliations
D. H. Huang, Air Force Research Lab. (United States)
G. Gumbs, Hunter College of the City Univ. of New York (United States)
M. Pepper, Cavendish Lab., Univ. of Cambridge (United States)

Published in SPIE Proceedings Vol. 7095:
Nanophotonics and Macrophotonics for Space Environments II
Edward W. Taylor; David A. Cardimona, Editor(s)

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