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 8 of 8 for “"waveguide coupling"”.
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Evaluation of optical solder for fiber-to-waveguide coupling in silicon photonics
… source, fast modulator, and effective fiber to waveguide coupler. The latest issue was addressed in this work. Coupling light efficiently from fiber to waveguide is challenging because of the size (6[mu]m core diameter for fiber, 500nm for waveguide), shape, and refractive index (~1.5 for fiber, …
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Sputtered silicon oxynitride for microphotonics : a materials study
Silicon oxynitride (SiON) is an ideal waveguide material because the SiON materials system provides substantial flexibility in composition and refractive index. SiON can be varied in index from that of silicon dioxide (n=1.46) to that of silicon-rich silicon nitride (n-2.3). This flexibility in …
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Integrated optical components for quantum key distribution
… In the first part of the thesis, a model for coupling 2D material emitters to rod-type photonic cavities is studied for room temperature single photon sources. Our investigated approach allows better coupling between the emitter and the cavity modes than conventional methods, while increasing …
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Three-Dimensional Optical Characterization of Heterogeneous Polymer Systems
… Three nondestructive optical methods: optical waveguide coupling, Fourier Transform Infrared (FTIR) spectroscopy and x-ray diffraction, were used to investigate the effect of the carbon black on the phase behavior and orientation of the films. It was found that the carbon black has little …
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Some studies on the computation and interpretation of seismic interface waves and modes in Earth’s mantle
… I identify this as an example of seismic waveguide coupling, show numerically that the coupling is stronger at lower frequencies, relate this to previous observations, and demonstrate that the coupling persists in nonspherically-symmetric planets. Finally, I generalise the finite-element …
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Germanium on Silicon Integrated Photonics for the Mid-Wave Infrared
… and communications. This work develops low-loss waveguides, a passive component library, integrated modulators, laser integration design, and systems analysis for the 2-5 µm wavelength range. Low-loss waveguides are demonstrated with losses of 0.6-2.5 dB/cm without top cladding. A detailed study …
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Subsurface two-photon lithography: improvements and applications
… Finally, we share improvements on SCRIBE-written waveguide insertion loss and preliminary data on possible applications. Overall, we detail both improvements to the fundamental process of SCRIBE and a variety of applications that are uniquely well-suited to SCRIBE.
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Materials science and design for germanium monolithic light source on silicon
… an external cavity Ge laser integrated with Si waveguides for a low threshold current and single mode operation. Heavy n-type doping was observed to change the Ge electronic band structure by band gap narrowing effect. We also found a failure of using a simple Drude model to explain free carrier …