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.
Results
Showing 1 to 18 of 18 for “"all dielectric"”.
-
Light-matter interactions in all-dielectric silicon nanoresonators
… to control light fields on a spatial scale far smaller than the wavelength of light has witnessed growing interest in recent years. This field has been driven by the advances in electronics and nanoscience that allow the precise sculpting of materials with precision down to the nanometer level. In …
-
Design and manufacturing of all-dielectric optical metamaterial with gradient index of refraction
… In this dissertation, two different purposes of all-dielectric GRIN optics on (1) film: light extraction enhancement of the scintillator; (2) slab: aberration-free focusing using Lüneburg lens, are both investigated. The scintillator made by ceramics like Lutetium Yttrium Orthosilicate (LYSO) …
-
The degradation of all-dielectric self supporting cables installed in high potential electro-magnetic fields.: A theoretical and practical evaluation of optical fibre cables strung independently on overhead power transmission lines
The operational life of all-dielectric self supporting (ADSS) optical fibre cables installed on high voltage over-head power transmission lines is limited by sheath degradation caused by induced electrical activity on the cable's surface. The work presented in this thesis describes research …
-
Dynamic Metasurfaces for Advanced Applications
… main areas. First we explore the subject of the all dielectric metasurface, implemented as arrays of dielectric cylinders. Here, we improve upon the current understanding of absorption in all-dielectric metasurfaces; we demonstrate the significance of periodicity, outlining special properties of …
-
Cylindrical photonic crystals
… waveguides in which light is confined laterally by the band gap of a cylindrically-layered photonic crystal. We show in particular that axially-uniform photonic band gap waveguides can exhibit novel behavior not encountered in their traditional index-guiding counterparts. Although the …
-
Achromatic and wide field-of-view metalens design
… simultaneously. The metalens is composed of all-dielectric meta-atoms selected from a large meta-atoms library with diverse dispersion behavior. The metalens and an aperture are integrated on opposite sides of the substrate to separate areas with different angle-of- incidents (AOIs). A …
-
Fabrication of anti-reflective and imaging nanostructured optical elements
… with optimized surfactants, I have experimentally shown that we can significantly enhance transmission from the surfaces of a glass slab, and at the same time make the surfaces either superhydrophobic or superhydrophilic, depending on the applications, such as antifogging and self-cleaning …
-
Time-dependent adjoint-based optimization of photonic crystals and metamaterials using a stabilized finite element method
… with photonic crystals, and in the second an all-dielectric metamaterial is designed. A motivation for optimizing photonic crystals is due to their use as multi-band optical waveguides for telecommunication applications. For this design optimization, to ensure smooth surfaces, Bezier curves …
-
Novel photonic phenomena in nanostructured material systems with applications and mid-range efficient insensitive wireless energy-transfer
… in the nanoscale is provided. In the class of all-dielectric material systems, techniques for the suppression of radiative loss from incomplete-photonic-bandgap structures are developed: the cancellation of radiation channeled into discrete modes of the substrate, for resonant …
-
Polymeric photonic crystals
… permits truly omnidirectional reflectivity for all polarizations of incident light over a wide selectable range of frequencies is derived and used in fabricating an all dielectric omnidirectional reflector consisting of multilayer films. Because the omnidirectionality criterion is general, it …
-
Design, fabrication, and characterization of optical and photonic metasurfaces
L'abstract è presente nell'allegato / the abstract is in the attachment
-
Topological photonic metasurfaces for light manipulation and strong light-matter interaction
… various photonic on-chip devices. Last decade all-dielectric periodic nanostructures (photonic metasurfaces) boost a growth of novel optical technologies, from ultra-sensitive detectors to compact beam structured lasers. Moreover, they represent one of the most promising platforms in which …
-
Controlling light-matter interaction with resonant semiconductor nanostructure
This thesis aims to bridge dielectric materials' optical and electronic properties to obtain full control of light-matter interaction at the nanoscale. The outcomes may open the way for tunable, ultra-thin, cost-effective, and energy-saving optoelectronic devices. This research first studies the …
-
Novel angular and frequency manipulation of light in nano-scaled dielectric photonic systems
… attracted wide attention from researchers, especially in the last decade, due to its ability to manipulate light at the nanoscale. In this thesis, we explore novel control of light created by nanophotonic structures, with a common theme on light interference in nanoscaled dielectric photonic …
-
Hybrid metal-dielectric metasurfaces for enhanced optical performance
… resonators and the spacing between them are smaller than the incident light. Metasurfaces can manipulate the amplitude, phase, and polarisation of the incident light by controlling the resonators’ shape, size, arrangement, type of material, and the surrounding environment. This allows for the …
-
Topological Insulating States in Photonics and Acoustics
… systems, including the bulk polarized crystalline insulator, quantum Hall effect edge state and quantum spin-Hall effect in 2D and 3D, Floquet topological insulator as well as topological crystalline insulators, have been emulated with great success in electromagnetic material, mechanical …