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 7 of 7 for “"plane-wave expansion"”.
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Modeling and characterization of elastic wave propagation in micro-scale photonic crystals
… Filtering, guiding and mirroring of elastic waves are a few applications in which phononic crystals can be used. In this manuscript, the physical origins of phononic bandgaps were successfully determined using a one-dimensional model to isolate resonances contributing to the creation of …
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Acoustic and mechanical properties of viscoelastic, linear elastic and nonlinear elastic composites
… approximation techniques, such as the asymptotic expansion method and the plane-wave expansion method, are used to obtain the macroscopic acoustic properties of the structure and to determine the frequency bands (passing and stopping bands) of the composite. Stress distribution in the viscoelastic …
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Sonic Crystal Noise Barriers
… size of the cylinders. Theoretical studies using Plane Wave Expansion (PWE), Multiple Scattering Theory (MST) and Finite Element Method (FEM) have enabled study of the performance of SC barriers. Strategies for improving the band gaps by employing the intrinsic acoustic properties of the scatterer …
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Algorithms and technologies for photonic crystal modelling
… photonic crystal structures created by the plane wave expansion method. Once validated the finite difference method was used in a genetic algorithm optimisation. It found that novel shaped rods can increase the size of photonic band gaps when compared with cylindrical rods.<br/><br/>A new …
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Terahertz oscillation and stimulated emission from planar microcavities
… with structural sizes in the range of the light wavelength, where the photonic modes are con- fined and the number of states is limited. In the smallest microcavities, i.e. micrometer sized optical resonators, the propagation of only one mode is permitted that is simultaneously amplified …
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Predictive simulation and design of III-V heterostructures for light emission and detection
… emission and detection at mid-infrared (mid-IR) wavelengths, for applications relevant to the environmental, industrial, medical, agricultural and defence sectors. We develop a robust framework to rigorously analyse the electronic and optical properties of III-V SLs. We employ a semi-analytical …
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Theory and simulation of quantum nanostructures for integrated photonics
… of QD heterostructures. Using a semi-analytical plane wave approach, QUDOS allows to compute the electronic structure of QD heterostructures. QUDOS includes strain and piezoelectric effects on the QD electronic structure, and allows to apply an arbitrarily oriented electric field to enable …