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 31 for “"optical coupling"”.
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Characterization of Optical Coupling and Back-reflection of Few Mode Fibers
… of a mode-division multiplexing (MDM) enabled optical sensor network that can use modes to interrogate either specific sensors or sensor subsystems, and specifically with quanitizing and optimizing the injection and detection of the signal of interest. A hypothetical test setup is demonstrated, …
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Magneto-Optic Spectroscopy and Near-Field Optical Coupling in Nanoparticle Composite Materials
… on the dipole approximation which accounts for optical coupling between magnetite particles. Qualitative correlations between theoretical calculations and experimental data suggest the shifts in spectral peak position depend on both interparticle distance and geometrical configuration.
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Digital Controller Implementation For Disturbance Rejection In The Optical Coupling Of A Mobile Experimental Laser Tracking Systems
… any given time. This research characterizes the optical coupling between two systems in a Mobile Experimental Laser Tracking system and evaluates several control solutions to minimize disturbances within this coupling. A simulation of the optical path was developed in an extensible manner such …
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Analysis of the optical coupling of wavelength-shifting fibers to organic liquid scintillator filled fluoropolymer tubes for industrial and nuclear security applications
… filled with organic liquid scintillator (OLS), optically read-out using wavelength shifting (WLS) fibers. The 1:400 ratio of diameter to length makes light collection from the organic scintillator very challenging. Over ten configurations of OLS, fluoropolymer tubes, and WLS fibers were tested. …
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Experiments with Bose-Einstein condensates in a double-well potential
… with Bose-Einstein condensates in an optical double-well trap. Coherent splitting of trapped condensates was performed by deforming an optical single-well potential into a double-well potential, and the relative phase of the two split condensates was shown to be reproducible. …
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Modeling of DFB surface emitting lasers and semiconductor laser arrays
… by systematically optimizing the device length, optical coupling and phase shifter in the device.
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Nano-optical studies of superconducting nanowire single-photon detectors
… of device uniformity and achieving efficient optical coupling. Nano-optical techniques such as confocal microscopy can be used to image localised areas of SNSPDs providing a direct measurement of the device uniformity. The work in this thesis describes both initial nano-optical testing at …
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Analysis and applications of coupled leaky-mode, implant-defined surface-emitting laser arrays
… atmospheric sensing, free-space and fiber-based optical links, high-power laser pumps, and optical imaging. Coherently coupled arrays exhibit desirable characteristics such as low beam divergence and high brightness. However, the fabrication procedures necessary for such designs are typically …
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Evanescently Coupled Vertical Cavity Laser Arrays
Evanescent optical coupling between elements in vertical cavity surface emitting laser (VCSEL) arrays is interesting for applications in areas such as optical communications, image processing, and electronic beam-steering. Past work in coherently coupled VCSEL arrays has resulted in out-of-phase …
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The development of novel passive and active photonic-crystal devices
… of smaller-radii rods. To provide efficient optical coupling between input/output dielectric waveguides and the photonic-crystal waveguide, an adiabatic taper having two stages is employed. Furthermore, the thesis investigates novel photonic-crystal devices and fabrication schemes. An …
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Novel infrared spectroscopic techniques for the study of adsorbed proteins on photoactive thin films
… to a zinc selenide ATR crystal by a high index optical coupling fluid, was designed and implemented, leading to a tunable optical structure for use with existing ATR setups. This ATR stack was shown to maintain resolution and signal intensity of traditional ATR configurations for both aqueous …
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High-Speed Modulation of Semiconductor Lasers and Modulators
… laser sources are critical components in optical communications systems and are presently the subject of intense research efforts. We present a comprehensive study of different modulation schemes. First, modulation schemes on a single semiconductor laser are investigated and compared for …
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Organic lateral heterojunction devices for vapor-phase chemical detection
… signal into an electrical signal. The poor optical coupling of the polymer's photoluminescence into a photodetector, reduces the signal-to-noise ratio (SNR) and overall sensor performance. In this work we have developed a novel transduction mechanism and device structure that enable more …
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Fully coupled electrical and optical simulation of vertical cavity surface emitting lasers
… the quantum well which are used to compute the optical coupling strengths between electrons and holes in various subbands. It is shown that inclusion of an accurate bandstructure is important for obtaining correct laser output characteristics such as the modulation response. Finally, a fast new …
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A Cavity-Coupled Rydberg Atom Array Platform for Quantum Computing
… of neutral atom Rydberg arrays with strong optical coupling to high-finesse cavities, we can build a new quantum architecture that oversteps many of the limitations of other hardware systems. In this dissertation, we lay out the case for coupling Rydberg atom arrays to cavities, discussing …
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Design and Analysis of the Onsala 4mm Receiver and other Antenna Configurations for Millimetre Wave Astronomy
… analysis was used to produce the fundamental optical design. This is computationally efficient, and provides all critical beam characterization through the optical train within the paraxial limit. The design was analysed more accurately with physical optics, using GRASP, a commercial software …
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Investigation of quantum information storage in rare earth doped materials
… quantum memory. Long coherence times in both the optical and hyperfine levels have been observed as well as optical manipulation of the nuclear spin states. The rare earth ions of interest also possess a linear Stark shift which is essential for the quantum memory under investigation here. The …
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Investigation of quantum information storage in rare earth doped materials
… quantum memory. Long coherence times in both the optical and hyperfine levels have been observed as well as optical manipulation of the nuclear spin states. The rare earth ions of interest also possess a linear Stark shift which is essential for the quantum memory under investigation here. The …
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Coupled phenomena in arrays of microplasma devices and microchannel plasma devices as antennas
… proposed and demonstrated. The microplasmas were optically and electrically probed in this work. The investigation showed that each plasma is physically separated and yet, under the proper conditions, is optically and/or electrically coupled to its neighbors. In arrays as large as 10 parallel …
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Dynamical tuning of phonon transport for information and energy control
… energy or information content. Reversing these couplings, thereby regulating atomic motion, only recently became plausible. This increased control would reduce parasitic losses and turn phonons into information carriers. Dynamical effects are a crucial and under-examined aspect of this control …
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