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Linear Mode Cmos Compatible P-N Junction Avalanche Photodiode For Smart-Lighting Applications, Md. Mottaleb Hossain
Linear Mode Cmos Compatible P-N Junction Avalanche Photodiode For Smart-Lighting Applications, Md. Mottaleb Hossain
Optical Science and Engineering ETDs
There is a need in emerging smart lighting concepts for a high-speed sensing capability to enable adaptive lighting (smart spaces) and visible light communication. One approach to address this need is to design and manufacture a novel complementary-metal—oxide—semiconductor (CMOS) compatible, cost-effective detector array and readout circuit (ROIC) that incorporates integrated waveguide detectors and avalanche photodiodes (APDs). This thesis focuses on the APD design and fabrication component of the sensing capability required by smart-lighting systems. Silicon CMOS compatible APDs are expected to provide high-speed and high-sensitivity sensors in terms of simplicity of design, low power consumption and cost-effectiveness for smart-lighting applications. …
Precise Characterization And Investigation Of Laser Cooling In Iii-V Compound Semiconductors, Chengao Wang
Precise Characterization And Investigation Of Laser Cooling In Iii-V Compound Semiconductors, Chengao Wang
Optical Science and Engineering ETDs
The physics and engineering issues associated with laser cooling of III-V compound semiconductors, in particular GaAs double heterostructures (DHS), are theoretically and experimentally investigated. This research addresses the key concepts of external quantum efficiency (EQE) and parasitic background absorption in a semiconductor laser cooler. The external quantum efficiency describes how well recombination radiation is removed from the cooling device and is precisely measured by All-optical Scanning Laser Calorimetry (ASLC). Using this technique, a record external quantum efficiency of 99.5% has been obtained with a GaAs laser cooler held at 100 K. However, high background absorption has hindered the observation of …
Three-Dimensional Imaging Using A Novel Rotating Point Spread Function Imager, Rakesh Kumar
Three-Dimensional Imaging Using A Novel Rotating Point Spread Function Imager, Rakesh Kumar
Optical Science and Engineering ETDs
The capability to achieve three-dimensional (3D) imaging in a single snapshot is a highly coveted goal for the imaging community. To be able to extend the depth-of-field while simultaneously encoding depth in the point spread function (PSF) itself allows an imaging solution which is less time consuming and less data intensive than the inefficient multiscan based conventional 3D imaging. Light-field cameras also achieve 3D imaging in a snapshot, but at the cost of greatly reduced resolution. Phase mask based depth encoding solutions have been proposed by other groups, but they all suffer from a relatively smaller depth-of-field. Recently there has …