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 20 of 89 for “"spectral response"”.
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Spectral response and conversion efficiency of P-N junctions
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1962.
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Characterization of spectral response of a quantum dots-in-a-well infrared focal plane array
Spectral characterization of a novel single bump, two-color InAs/InGaAs quantum dots-in-a-well (DWELL) infrared focal plane array (FPA) was undertaken and reported here. The hypothesis of the study is that the FPA will exhibit bias-tunable spectral response. Broadband and two-color performance …
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Fabrication and Optoelectronic Characterization of Nanoscale Resonance Structures
… metal-semiconductor-metal photodiodes. The spectral response of the nanoscale resonance photodiode was determined by measuring the photocurrent or photovoltage resulting from incident monochromatic light which was swept through wavelengths from 400 nm to 2000 nm. The previously mentioned …
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Photonic Crystal Enhanced-Fluorescence and Label -Free Bioimaging
… label-free imaging resolution based on resonance spectral characteristics. Devices are characterized by patterning a resolution standard onto the sensor using photolithography, and excellent design control over label-free imaging resolution is demonstrated. The spectral response of a photonic …
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Photoexcitation of rare earth and metal-halide molecules in the ultraviolet
… by photopumping in the ultraviolet. Knowing the spectral response of these molecules with respect to incident light and understanding the energy level structure entailed would be useful to establish their suitability for lighting or lasing. This thesis describes the spectroscopic experiments …
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Bragg grating filters for optical networks
… scattering method, but produces a similar spectral response quality. These gratings have either modulated refractive index or chirp rate. Then, we propose a reconfigurable phase-code encoder. The device is composed of a uniform grating, with a number of equidistant fine wires for the …
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Comparative study of dilute nitride and bismide sub-junctions for tandem solar cells
… the dark current generated by the devices, the spectral response of the solar cells especially in the dilute nitride and bismide absorption regions, and efficiency responsivity to temperature and to elevated radiation. To achieve the latter objectives, dark and under the AM1.5G and spectral …
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Internal Photoemission and Energy Band Discontinuities at Semiconductor Heterojunctions
… The technique involves measuring the spectral response of specially designed p$\sp{+}$N$\sp{-}$ heterojunction photodiodes. Internal photoemission from the valence band of the p$\sp{+}$ layer is observed in these devices and power law fits are used to accurately extract the threshold …
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Vertical waveguide-coupled microring resonator: Design and simulation
… coupler determines the performance, size, and spectral response. Recently, Chin and Ho demonstrated a conformal transformation method in calculating the coupling in micron-scale microring resonators. This method has been shown to give fast and accurate results in calculating the properties of …
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Case Studies in Invertebrate Visual Processing: I. Spectral and Spatial Processing in the Early Visual System of Drosophila melanogaster II. Binocular Stereopsis in Sepia officinalis
… how flies process colour information, or how the spectral content of light affects other visual modalities. With the aim to accurately dissect the different components of the Drosophila visual system responsible for processing colour, I have developed a versatile visual stimulation setup to probe …
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Detection and attribution of drought and oil-induced plant stress using hyperspectral remote sensing
This study investigates the potential use of hyperspectral remote sensing in detecting stress in vegetation caused by both drought stress and hydrocarbon contamination of the soil. Spectral and plant biochemical measurements were taken from an in-situ field experiment and a glasshouse experiment at …
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Engineered quantum dots for infrared photodetectors
… (TEM) images, enhanced s-to-p polarized spectral response ratio of 37% compared with 10% for conventional SK-QD, and improved SK-QDIP characterization such as: high operating temperature of 150K under background-limited infrared photodetection (BLIP) condition, photodetectivity of 1x109 …
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GeSn Light-Emitting Devices
… photodiodes were characterized with I-V and the spectral response. The absorption spectral response was measured with different Sn composition devices, showing the extended detection range towards mid infrared. The characterizations of GeSn based optoelectronic devices in this thesis demonstrated …
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Narrowband Photodetection in the Short-wavelength Infrared with a Plasmon-induced Hot Electron Device
… patterned on a silicon substrate, the absorption response can be combined with plasmon-induced hot electron photocurrent generation. This yields a photodetector with a strongly resonant, narrowband photocurrent response in the infrared, limited at low frequencies by the Schottky barrier, not the …
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HIGHLY-CONCENTRATED SUNLIGHT SEPARATION FOR WIDE-SPECTRUM SOLAR ENERGY HARVESTING
The narrow spectral response (0.4 μm ≤ λ < 1.2 μm) of a crystalline (c-Si) cell has limited photons in the lower energy states from forming electron-hole pairs for electricity generation. Resultantly, the majority portion of AM1.5 spectrum (1.2 μm ≤ λ ≤ 2.5 μm) that cannot undergo PV conversion …
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Advances In The Opto-mechanical Design And Alignment Of The Hehsi Imaging Spectrometer Based On A Sagnac Interferometer
The High Efficiency HyperSpectral Imager (HEHSI) is a Fourier Transform hyperspectral imager based on a Sagnac interferometer. This thesis research concentrates on the design upgrade and calibration of HEHSI from a proof of concept instrument to a prototype field instrument. Stability is enhanced …
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A study of periodic gratings in planar dielectric waveguides
… selective mirrors making them very useful as spectral filters for wavelength division multiplexing applications and as end mirrors for narrow linewidth lasers. A study of the spectral characteristics of both single and double gratings in planar dielectric waveguides is presented. The analysis …
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Bidirectional Distribution Reflection Function of Algodones Dunes
… power supply, and mechanical arm to study the spectral responses of the sand samples from the field. During the laboratory measurements, the reflectance of each of the sand sample, was observed from different view angles to replicate field measurement techniques. Through both approaches it was …
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Photodetection in Silicon Pyramidal Microdischarges
… circuit, microfabrication techniques. The response of the devices to a 780-nm laser diode was shown to have an absolute photosensitivity of greater than 3.5 A/W. The absolute spectral response of the active plasma devices closely resembles the response of other silicon devices. The 100 x …
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Advanced fibre gratings and their applications
… were developed, enabling simulations of spectral response in terms of reflectivity, bandwidth, sidelobes and dispersion of gratings of different structures including uniform and chirped, phase-shifted, Moiré, sampled Bragg gratings, phase-shifted and cascaded long-period gratings. …
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