Resonant Cavity-Enhanced (RCE) Photodetectors

Katsumi Kishino, M. Selim Ünlü, Jen Inn Chyi, J. Reed, L. Arsenault, Hadis Morkoç

Research output: Contribution to journalArticlepeer-review

302 Scopus citations


The photosensitivity characteristics of resonant cavity-enhanced (RCE) photodetectors have been investigated. The photodetectors were formed by integrating the active absorption region into a resonant cavity composed of top and bottom (buried) mirrors. A general expression for quantum efficiency η for RCE photodetectors was derived taking the external losses into account. Drastic enhancement in 17 is demonstrated at resonant wavelengths for a high quality factor Q cavity with a very thin absorption layer. An improvement by a factor of 4 in the bandwidth-efficiency product for RCE p-i-n detectors is predicted. Device parameters for achieving very high η (> 0.99) without very thick absorption layers and any antireflection coating was discussed. Molecular beam epitaxially grown RCE-heterojunction phototransistors (RCE-HPT) were fabricated and measured demonstrating good agreement of the experiment and the theory. The wavelength selectivity of RCE detection was applied to wavelength demultiplexing. Crosstalk attenuation and efficiency-crosstalk product were calculated for various device parameters. Such a wavelength demultiplexing device was demonstrated by monolithically integrating three RCE-HPT's tuned at different wavelengths. The crosstalk attenuation was 12 dB.

Original languageEnglish
Pages (from-to)2025-2034
Number of pages10
JournalIEEE Journal of Quantum Electronics
Issue number8
StatePublished - Aug 1991


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