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 12 of 12 for “"Optical detectors"”.
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Concentric-core optical fiber sensors
… strain sensor which uses concentric core optical fiber waveguide as the sensing element. When this particular type of fiber is strained, a transfer of optical power occurs between propagating modes in the two concentric cylindrical cores of the fiber. This strain-induced redistribution of …
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Double Alternating Minimization (DAM) for Phase Retrieval in the Presence of Poisson Noise and Pixelation
<p>Optical detectors, such as photodiodes and CMOS cameras, can only read intensity information, and thus phase information of wavefronts is lost. Phase retrieval algorithms are used to estimate the lost phase and reconstruct an accurate effective pupil function, where the squared modulus of its …
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Measurement and Modeling of OPNMR Phenomena in GaAs Semiconductors
… spin densities (≤ 10<sup>17</sup> nuclei). Optically pumped NMR (OPNMR) provides one method to get around this sensitivity barrier by utilizing the high electronic polarizations that can be generated through the application of polarized light.</p><p>Semiconducting materials are the …
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The evaluation and the application of array detectors for analytical luminescence spectroscopy.
… evaluation and application of a new class of optical detectors, two-dimensional charge-coupled device (CCD), for low-light level chemiluminescence and other luminescence spectroscopies. This research conclusively demonstrates the superior qualitative and quantitative performance of …
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Peculiar perovskites: Unraveling the unique optical response of hybrid organic-inorganic perovskites from first principles
… including solar cells, light-emitting diodes, optical detectors, and spintronics due to their unique atomic, electronic, and optical properties. HOPs and LHOPs are hosts to fascinating microscopic interactions that influence their macroscopic optical and electronic properties. Researchers still …
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Three-Dimensional Microscopy by Laser Scanning and Multi-Wavelength Digital Holography
… for a greater flexibility, as the variety of optical detectors, such as PMT and position-sensitive quadrant photodiode can be used to acquire images. The system demonstrates a simple, low-cost method of achieving the resolution on the order of a micron. A further gain in terms of resolution …
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First Principle Modeling of Hybrid Halide Perovskites for Optoelectronic Applications
… to current technologies. Devices with impressive optical and electronic properties are being made in the lab, but a robust theoretical understanding on the underlying photophysics in HPs is required to improve current devices and predict future devices. The causes for positive device behaviors …
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Development of a simulation environment for the analysis and the optimal design of fluorescence detectors based on single photon avalanche diodes
… on the parameters of the fluorescence detectors. The features of single-photon avalanche diodes (SPAD) make these optical detectors a good alternative to conventional photomultiplier tubes and micro-channel plates. CMOS technology allows cointegration of a SPAD and electronic circuits …
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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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The measurement, creation and manipulation of quantum optical states via photodetection
… the measurement of mean photon numbers at optical sideband frequencies using homodyne detection. We use our technique to provide a direct comparison to photon-counting measurements and observe that our technique exhibits superior speed, dynamic range and mode selectivity compared to photon …
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Self-assembled optical diffraction sensor for water quality monitoring : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Engineering, Massey University, Albany, New Zealand
… involves the potential usage of self-assembled optical diffraction patterns of a thiol compound (dithiothreitol or glutathione) on the gold-coated glass. The self-assembled patterns are obtained through a microcontact printing (µCP) procedure. Gold binds with the thiol compound through an Au-S …
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All-optical photoacoustic and laser-ultrasonic imaging in heterogeneous tissue
… low in biological tissue. In contrast, optical properties are highly specific, but imaging with light is typically limited to depths of about 1mm. Therefore, we aim to create images of both acoustic and optical properties centimeters deep in tissue non-invasively. Laser-induced acoustic …