Microwave response of a coplanar waveguide phase shifter to pulsed optical illumination

M. S. Islam

doi:10.1117/12.2301563

1 December 1990 Microwave response of a coplanar waveguide phase shifter to pulsed optical illumination

M. S. Islam

Proceedings Volume 1514, 15th International Conference on Infrared and Millimeter Waves; 151449 (1990) https://doi.org/10.1117/12.2301563
Event: 15th International Conference on Infrared and Millimeter Waves, 1990, Orlando, FL, United States

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.

Citation Download Citation

M. S. Islam "Microwave response of a coplanar waveguide phase shifter to pulsed optical illumination", Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 151449 (1 December 1990); https://doi.org/10.1117/12.2301563

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