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 3 of 3 for “"active metasurface"”.
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Reconfigurable Photonics based on Broadband Low-loss Optical Phase Change Materials
… (GST), exhibit large contrast of both refractive index (Δn) and optical loss (Δk), simultaneously. The coupling of both optical properties fundamentally limits the function and performance of many potential applications. We report a new class of O-PCMs, Ge-Sb-Se-Te (GSST) which breaks this …
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Development of Active Terahertz Modulators for use with Quantum Cascade Lasers and Near-Field Imaging of their Individual Resonators
This thesis describes the development of active terahertz modulators based on arrays of coupled resonators loaded with monolayer graphene. The structures affect the amplitude, phase, and polarisation of the transmitted and reflected radiation. These devices were simulated using finite element …
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Control of Optical Processes in Diamond using Plasmonic Nanogap Cavities
… novel approach to creating film-coupled nanogap metasurfaces was developed to support this research and consists of transferring EBL-fabricated nanoparticles by using a PDMS stamp. Up to seven orders of magnitude of enhancement of nonlinear frequency conversion was also observed in diamond thin …