Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Infrared Photodetector"”.
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Fabrication of nonlithographic semiconductor quantum wire infrared photodetector
… describes novel semiconductor quantum wire infrared photodetectors in the long- and very long-wavelength regions. The infrared photodetectors are based on intersubband transitions in semiconductor quantum wires and have the potential for higher operational temperature, increased …
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Growth and optimization of quantum dots-in-a-well infrared photodetectors
Quantum dot infrared photodetectors (QDIPs) have been shown to be a key technology in mid and long wavelength (3-14 μm) infrared detection due to their potential for normal incidence operation and low dark current. In our research group, we have been investigating infrared detectors based on …
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Cross-Sectional Scanning Tunneling Microscopy Investigations of Cleaved Iii-V Heterostructures
… tunneling diode (RTD) structures, a quantum well infrared photodetector structure and a modulation doped field effect transistor (MODFET) structure. XSTM has proved useful in characterizing interface roughness, alloy fluctuations and individual atomic positions.
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Antimony-based type-II superlattice infrared detectors
… applications within the mid- and long-wavelength infrared are driving the search for efficient and cost effective detection technologies in this regime. Theoretical calculations have predicted high performance for InAs/GaSb type-II superlattice structures, which rely on mature growth of III-V …
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Au nanorods-semiconductor nanowire hybrid nanostructures : nanofabrication techniques and optoelectronic properties
… of Au nanorods - ZnO nanowire FET tunable near-infrared photodetector are investigated. In particular we demonstrated orders of magnitude enhancement in the photocurrent intensity in the explored range of wavelengths and 40 times faster time response compared to the bare ZnO FET detector. The …
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Multispectral Metamaterial Detectors for Smart Imaging
<p>The ability to produce a high quality infrared image has significantly improved since its initial development in the 1950s. The first generation consisted of a single pixel that required a two-dimensional raster scan to produce an image. The second generation comprised of a linear array of …
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Fast Multilevel Algorithms for the Electromagnetic Analysis of Quasi-Planar Structures
… class, including rough surfaces, quantum well infrared photodetector gratings, planar microwave circuits, microstrip arrays, diffractive optical elements, and solar cells. The prediction of electromagnetic radiation and scattering is essential in applications involving the structures listed …
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Engineered quantum dots for infrared photodetectors
Quantum Dot Infrared Photodetector (QDIP) Focal Plane Arrays (FPAs) have been proposed as an alternative technology for the 3rd generation FPAs. QDIPs are emerging as a competitive technology for infrared detection and imaging especially in the midwave infrared (MWIR) and longwave infrared (LWIR) …
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Theory and Experiment of Antimony-Based Type-Ii Superlattice Infrared Photodetectors
… material system for the next generation of mid-infrared photodetector focal plane arrays (FPAs). In order to understand the underlying physics and to improve the device performance of this emerging technique, InAs/InGaSb superlattice photodetectors are studied theoretically and experimentally in …
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Physics of intraband quantum dot optoelectronic devices
… and detectors of radiation in the mid- and far-infrared region of the spectrum. Much of a success has been obtained with quantum well based intraband devices, such as quantum cascade lasers and quantum well infrared photodetectors. However due to longer carrier lifetimes in quantum dots, it is …
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Heterostructure engineering of quantum dots-in-a-well infrared photodetectors
… and large format arrays. The quantum dot infrared photodetector technology, owing to the three-dimensional confinement of carriers, the richness of the electronic spectra in quantum dots, and the mature III-V based fabrication technology, satisfy these requirements. This work focuses on …
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Si-based Germanium Tin Photodetectors for Short-Wave and Mid-Wave Infrared Detections
… and inexpensive imaging system working in the infrared range keeps increasing for the last decade, especially for civil applications. Although several group IV materials such as silicon and germanium are used to realize detectors in the visible and near infrared region, they are not the …
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Dopant Incorporation in InAs/GaAs Quantum Dot Infrared Photodetectors
<p>Quantum Dot Infrared Photodetectors (QDIPs) are important alternatives to conventional infrared photodetectors with high potential to provide required detector performance, such as higher temperature operation and multispectral response, due to the 3-D quantum confinement of electrons, discrete …