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 6 of 6 for “"Leaky-waves"”.
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Propagation of Leaky Waves in Free Surfaces and Grating Structures on (100)-Cut Gallium-Arsenide
… understand the details of propagation of the leaky wave through metal grating structures in $\{$100$\}$-cut GaAs. This objective was met by first understanding wave propagation in free-surface GaAs and subsequently exploring a buried bimetallic electrode structure which will present minimum …
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Metal-insulator-insulator-metal plasmonic waveguides and devices
… transfer matrix formalism reveals both bound and leaky SP modes: three lowest energy bound modes and the highest energy mode consisting of non-radiative (bound) and radiative (leaky) portions separated by a spectral gap at the light line. The leaky regime is further divided into antenna and …
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High-efficiency Waveguide Tunable Leaky-wave Antennas and Phase-shifters
… one can increase the radiation efficiency of leaky-wave beam-steerable antennas. In this effort, both frequency and fixed frequency scanned leaky-wave antennas are considered. Specifically, we discuss the design and implementation of a slow-wave frequency-scanned leaky-wave antenna that can …
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Defect characterization in concrete elements using vibration analysis and imaging
… are practical and effective for sensing leaky waves and local resonances in concrete, and thus can be used for IE tests. The proposed air-coupled sensor is cost-effective and does not require external power, signal conditioning, nor acoustic shielding against ambient acoustic noise. …
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Developments and applications of THz polaritonics, efficient THz generation, and single-shot THz detection
… to perform time resolved imaging of terahertz waves propagating within a photonic crystal slab. For photonic lattices with different orientations and symmetries, we observed the full spatiotemporal evolution of terahertz fields across a broad spectral range spanning the photonic band gap. In …
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Tailoring the emission of stripe-array diode lasers with external cavities to enable nonlinear frequency conversion
… of neighboring emitters or the presence of leaky waves, a strong coupling between the emitters exists. As a consequence, the emission of such an array is characterized by a so called supermode. However, for the free running stripe-array mode competition between several supermodes occurs …