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|Title:||Resonant Cavity Enhanced Photodetectors and Optoelectronic Switches|
|Author(s):||Unlu, Mahmut Selim|
|Doctoral Committee Chair(s):||Morkoc, H.|
|Department / Program:||Electrical Engineering|
|Degree Granting Institution:||University of Illinois at Urbana-Champaign|
|Subject(s):||Engineering, Electronics and Electrical
Physics, Condensed Matter
|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.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1992.
|Date Available in IDEALS:||2014-12-16|
This item appears in the following Collection(s)
Dissertations and Theses - Electrical and Computer Engineering
Dissertations and Theses in Electrical and Computer Engineering
Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois