Abstract

A photodetector that is selective to the polarization, the frequency, and the angle of incident light is presented. Surface plasma modes excited at the surface of a semiconductor–metal–insulator structure provide selective coupling of light into the semiconductor with increased quantum efficiency. Two types of surface modes (TM₀ and TE₀) are realized by special choices of grating periodicity and insulator film thickness. TM₀ modes have a resonant sensitivity to p-polarized light, whereas TE₀ modes have a resonant sensitivity to s-polarized light. In addition, for both types of mode the resonance frequency is tunable in a wide range. By combining the selective properties of the surface modes with conventional photodetective devices, we can realize frequency, polarization, and angle-dependent detectors.

© 1988 Optical Society of America

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