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Proceedings Paper

Microwave response of a coplanar waveguide phase shifter to pulsed optical illumination
Author(s): M. S. Islam
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Paper Abstract

It has recently been shown that a microwave signal carried on a Schottky-contacted coplanar waveguide (CPW) on a GaAs substrate can undergo large phase shifts when the structure is optically illuminated, even at very low illumination intensities1. Past experiments have been made only for continuous (CW) illumination of the CPW. However, the response of the device to time-varying optical illumination is of great importance for microwave and optoelectronic applications where dynamic operation is required. In this paper we present preliminary measurements of response times of optically illuminated CPW phase shifters. Results indicate the possible presence of optically active semiconductor trap states with extremely slow response times, which dominate the microwave propagation characteristics of the CPW. A possible way to prevent this "optical back-gating" effect will also be discussed.

Paper Details

Date Published: 1 December 1990
PDF: 3 pages
Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 151449 (1 December 1990); doi: 10.1117/12.2301563
Show Author Affiliations
M. S. Islam, Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 1514:
15th International Conference on Infrared and Millimeter Waves
Richard J. Temkin, Editor(s)

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