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Design and optimization of high-speed resonant cavity enhanced Schottky photodiodes

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7 Author(s)
Gokkavas, Mutlu ; Dept. of Electr. Comput. Eng., Boston Univ., MA, USA ; Onat, B.M. ; Ozbay, E. ; Ata, E.P.
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Resonant cavity enhanced (RCE) photodiodes (PD's) are promising candidates for applications in optical communications and interconnects where high-speed high-efficiency photodetection is desirable. In RCE structures, the electrical properties of the photodetector remain mostly unchanged; however, the presence of the microcavity causes wavelength selectivity accompanied by a drastic increase of the optical field at the resonant wavelengths. The enhanced optical field allows to maintain a high efficiency for faster transit-time limited PD's with thinner absorption regions. The combination of an RCE detection scheme with Schottky PD's allows for the fabrication of high-performance photodetectors with relatively simple material structures and fabrication processes. In top-illuminated RCE Schottky PD's, a semitransparent Schottky contact can also serve as the top reflector of the resonant cavity. We present theoretical and experimental results on spectral and high-speed properties of GaAs-AlAs-InGaAs RCE Schottky PD's designed for 900-nm wavelength

Published in:

Quantum Electronics, IEEE Journal of  (Volume:35 ,  Issue: 2 )

Date of Publication:

Feb 1999

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