Theory and experiments of a three-cavity wavelength-selective photodetector.
We propose a novel wavelength-selective photodetector with three subcavities, i.e., a filtering cavity, a spacer cavity, and an absorption cavity, for obtaining a narrow spectral response linewidth and a high quantum efficiency simultaneously. A theoretical prediction has been made that a less than 1-nm linewidth and a quantum efficiency as high as 90% are possible. We discuss the effects of the key factors on the performance of this type of photodetector that has been designed and fabricated. A spectral response linewidth of approximately 1.4 nm (FWHM) and an external quantum efficiency higher than 50% have been achieved experimentally. Such devices are promising for wavelength-division multiplexing applications.
Liu
K
K
Beijing University of Posts and Telecommunications, Post Office Box 66, Beijing 100876, China. yqhuang@noya.bupt.edu.cn
Huang
Y
Y
Ren
X
X