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Proceedings Paper

Photoconductive materials for THz generation at 1550 nm: ErAs:GaAs vs InGaAs based materials
Author(s): Matthieu Martin; Elliott R. Brown
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Paper Abstract

Since the 1990s the photoconductive material of choice for THz generation has been low-temperature grown GaAs (LTG-GaAs) thanks to its useful mobility (~200 cm2/V.s), high dark resistivity (~107 Ω.cm), and fast carrier lifetime (~0.2 ps). However, due to the band gap energy of GaAs, the usual optical drive wavelength is around 800 nm where suitable lasers, both cw and pulsed, tend to be marginal in output power and rather expensive. Consequently, research has pushed towards the development of InGaAs-on-InP-based ultra-fast photoconductive materials operating at 1550-nm where cw and pulsed lasers are superior in all respects. Recently, we discovered ultrafast extrinsic photoconductivity in ErAs:GaAs at 1550 nm, allowing the generation of both cw and pulsed THz waves. GaAs-based materials have major electrical advantages over InGaAs-based because of their superior dark resistivity and breakdown field. In this paper, we show that 1550-nm-driven ErAs:GaAs is now a promising alternative to InGaAs-based photoconductive material. We focus on the ultrafast photoconductive behavior, and compare the performance of ErAs:GaAs photoconductive switches to those from state-of-the-art ultrafast InGaAs devices.

Paper Details

Date Published: 14 March 2015
PDF: 8 pages
Proc. SPIE 9362, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII, 936207 (14 March 2015); doi: 10.1117/12.2086868
Show Author Affiliations
Matthieu Martin, Wright State Univ. (United States)
Elliott R. Brown, Wright State Univ. (United States)

Published in SPIE Proceedings Vol. 9362:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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