Resonant Cavity Enhanced Photodetectors and Optoelectronic Switches
Unlu, Mahmut Selim
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https://hdl.handle.net/2142/71986
Description
Title
Resonant Cavity Enhanced Photodetectors and Optoelectronic Switches
Author(s)
Unlu, Mahmut Selim
Issue Date
1992
Doctoral Committee Chair(s)
Morkoc, H.
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Physics, Condensed Matter
Physics, Optics
Abstract
Described in this thesis is an investigation of novel structures consisting of optoelectronic devices integrated into Fabry-Perot resonant cavities. The photosensitivity of conventional detectors is governed by the optical properties of the semiconductor material requiring thick absorption regions for high quantum efficiencies. It is desirable to enhance the quantum efficiency without increasing the active layer thickness to optimize the bandwidth. The resonant cavity enhanced (RCE) detection scheme can be used in many different detector designs to improve the device sensitivity without any detrimental effects on the device speed. This thesis examines the photosensitivity characteristics of RCE detectors and optoelectronic switches, both experimentally and theoretically.
The first derived formulation of the RCE detection is presented, and the dependence of the quantum efficiency on the cavity and device parameters, the influence of the standing wave, and design consideration issues are addressed. The theoretical predictions are verified by experimental results on a RCE heterojunction phototransistor grown by molecular beam epitaxy. A novel transient simulation method is developed to analyze the high-speed implications of RCE detection and a threefold improvement in the bandwidth-efficiency product is predicted. In addition to enhancing the photosensitivity at the desired wavelength, the RCE detection scheme also provides wavelength selectivity. Spectral response properties and resonant wavelength tuning are described and a monolithic wavelength demultiplexing receiver is demonstrated. Combining the spectral properties of the RCE scheme with the bistable operation of photothyristor, a novel wavelength selective optoelectronic switch is demonstrated.
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