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 38 for “"optical filters"”.
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Silicon-based tunable optical filters
… of a new class of silicon-based tunable optical filters. For this purpose a Fabry-Perot structure was chosen and implemented as a thin-film interference filter. The filter layers were configured as a self-supporting square membrane with side lengths of a few hundred microns. The approach …
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Integrated optical filters using Bragg gratings and resonators
This thesis provides an in-depth study of optical filters made using integrated Bragg gratings and Bragg resonators. Various topologies for making add/drop filters using integrated gratings are outlined. Each class of devices is studied in detail and the theoretical tools needed for designing the …
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A performace analysis of optical filters in direct detection receivers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
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Design, fabrication and measurement of integrated Bragg grating optical filters
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Development of Tunable Optical Filters for Interrogation of White-Light Interferometric Sensors
… to be used. In this Ph.D. research, a tunable optical filter based WLI (TOF-WLI) is proposed and validated as a low cost, yet high performance, solution to the interrogation of various types of interferometric sensors. In addition to the capability of linear/quadrature demodulation, TOF-WLI …
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CMOS SINGLE-PHOTON AVALANCHE DIODES AND MICROMACHINED OPTICAL FILTERS FOR INTEGRATED FLUORESCENCE SENSING
… sensing, namely, the design of integrated optical sensors and the fabrication of high-rejection micro-scale optical filters. Two novel enabling technologies were introduced. They are: the perimeter-gated single-photon avalanche diode (PGSPAD), for on-chip photon counting, and the …
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Linear Optical Thin Films Formed by Electrostatic Self-Assembly
… coatings. The feasibility of fabricating linear optical interference filters by ESA methods is demonstrated in this thesis work. Basic single-anion/single-cation ESA films are synthesized and their optical parameters -- refractive index and average thickness for individual bilayer -- are …
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Nanometer-scale placement in electron-beam lithography
… tools is insufficient to fabricate narrow-band optical filters and lasers, which require sub-micrometer-pitch gratings with a high degree of spatial coherence. Moreover, it is widely recognized that placement accuracy will not be sufficient for future semiconductor device generations, with …
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Photorefractives for fast optics
… and theoretical study into the nonlinear optical<br/>properties of novel photorefractive materials and devices. The focus of the work is<br/>centred on bringing together the attractive attributes of inorganic and organic<br/>materials in a single hybrid device and to increase the …
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Tunnel filters and optical amplifiers for use in fiber optic communication systems
… and double-layer dielectrics in which optical tunneling occurs are shown to serve as the basis of optical filters, the double-layer tunnel filter having a much higher resolution capability than the single-layer tunnel filter. Optical amplifiers used as a receiver preamplifier and as …
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Long-term analysis of a small-scale concentrated photovoltaic-thermal system with a nanoparticle-based optical filter
… (CPV-T) system that uses nanofluid-based optical filters, which can generate electricity and absorb heat from sunlight. Although spectral filtering CPV-T systems have been explored in the literature for power generation, they have not been investigated for domestic applications. In this …
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Accurate nanofabrication techniques for high-index-contrast microphotonic devices
… for sharp waveguide bends and small dielectric optical resonators. They allow dense optical integration and unique applications to optical filters and sensors but present exceptional complications in design and fabrication. In this work, nanofabrication techniques are developed to address the …
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Wavelength division multiplexing technology and systems
… employing moderate speed electronics. Passive optical filters play a crucial role in such networks serving the function of combining and separating multiple wavelengths. Single and multiple cavity F-P filters are analyzed with particular emphasis on their bandwidth and tuning range. Fabry-Perot …
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Thermophotovoltaics : shaping the flow of thermal radiation
… and two dimensional photonic crystals as optical filters and selective thermal emitters for thermophotovoltaic and micro-thermophotovoltaic (micro-TPV)) applications. In addition, we explore fundamental limitations of photonic crystal thermal emitters and provide new insights into the …
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Self-Assembled Multilayered Dielectric Spectral Filters
Thin film optical filters are made by depositing thin films of optical materials on a substrate in such a way as to produce the required optical and mechanical properties. The Electrostatic Self Assembly (ESA) process is accomplished by the alternate adsorption of poly-anionic and poly-cationic …
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Multivariate Statistical Methods that Enable Fast Raman Spectroscopy
… of spectrometer, that uses computer-controlled optical filters to efficiently capture Raman photons and multiplex them onto either one or two photon counting detector(s). This method, referred to as optimal-binary compressive detection (OB-CD), allows for the collection of chemical information …
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Nanometer-precision electron-beam lithography with applications in integrated optics
… for future integrated-circuits and integrated-optical devices. Environmental disturbances, system imperfections, charging, and a variety of other factors contribute to pattern-placement inaccuracy. To overcome these limitations, spatial-phase locked electron-beam lithography (SPLEBL) monitors …
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Remote three-dimensional temperature sensing using planar laser induced fluorescence : development and applications to microwave heated liquids
… Fluorescence (PLIF) imaging. Temperatures were optically determined from ratiometric measurements of the fluorescence from a pair of molecular probes. A Dextran polymer labeled with Rhodamine B was used as a temperature-sensitive probe that operates between 20 and 60 ⁰C. A second …
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Designing Plasmonic Materials And Optical Metasurfaces For Light Manipulation And Optical Sensing
… are artificial materials designed to create optical properties that do not exist in nature. They are assemblies of subwavelength structures that are tailored in size, shape, composition, and orientation to realize the desired property. Metamaterials are promising for applications in diverse …
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Développement d'un dispositif intégré de photodétection de grande sensibilité avec discrimination spectrale pour les laboratoires sur puce
… realization and characterization of integrated optical filters for fluorescence detection. The detection device implements a Buried Quad Junction photodetector (BQJ) and charge sensitive preamplifiers for the simultaneous treatment of its four outputs. The chip was made in 0.8μm High Voltage …
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