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Showing 1 to 20 of 197 for “"Photonic crystals"”.
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Polymeric photonic crystals
… for creating one, two and three dimensional photonic crystals out of self-assembling block copolymers has been formulated. In order to form useful band gaps in the visible regime, periodic dielectric structures made of typical block copolymers need to be modified to obtain appropriate …
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Cylindrical photonic crystals
… thesis, we explore the properties of cylindrical photonic crystal 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 …
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Phosphors and photonic crystals
… to synthesise well ordered bare opal templates. Photonic phosphor crystals of Y2O3: Eu, Tb, Gd and Y2O3: Tm were synthesised using these templates to study the photonic band gap properties. Nano-sized Y2O3: Eu phosphors have been successfully incorporated into mono-dispersed silica spheres which …
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Addressable plasma photonic crystals
Photonic crystals that comprise arrays of microplasmas can act as recon g- urable lters in the microwave and THz spectral regions. When compared to conventional photonic crystals fabricated in a solid, plasma photonic crystals are recon gurable at electronic speeds which, in turn, allows for the …
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Block copolymer photonic crystals
This thesis explores the photonic properties of block copolymer systems. One dimensionally periodic dielectric stacks are fabricated with symmetric, lamellar forming, copolymer systems: diblock copolymers, solvent swollen BCP materials, and homopolymer swollen BCP blends. Each system exhibits …
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Active materials in photonic crystals
… from embedding active materials inside of photonic crystal structures. These structures strongly modify the photonic local density of states (LDOS), leading to quantitative and qualitative changes in the behavior of active materials. First, I show that the emission spectrum of point-like …
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Scattering matrix analysis of photonic crystals
… transmission of waves through a two-dimensional photonic crystal which consists of a periodic array of parallel rods with circular cross sections. Without making any assumptions about normal incidence, single mode propagation, and sufficient inter-scatter separation in the direction of …
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Polymer and metallodielectric based photonic crystals
The bottom-up colloidal synthesis of photonic crystals has attracted interest over top-down approaches due to their relatively simplicity, the potential to produce large areas, and the low-costs with this approach in fabricating complex 3-dimensional structures. This thesis focuses on the bottom-up …
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Energy transduction in surface photonic crystals
Made available in DSpace on 2011-05-25T15:04:54Z (GMT). No. of bitstreams: 2 Yang_Fuchyi.pdf: 3350098 bytes, checksum: 697b099788cd27773a8860796f30e8cc (MD5) license.txt: 4059 bytes, checksum: 1695dae68788bc80711de687b52ed4c9 (MD5)
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Reconfigurable, two-dimensional plasma photonic crystals
Photonic crystals, composed of arrays of microplasmas, affect the propagation of electromagnetic waves and can act as reconfigurable filters in the GHz-THz spectral regions. Plasma photonic crystals are reconfigurable at electronic speeds. In addition, they rapidly alter the transmission …
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Photonic crystals for high temperature applications
… and experimental realization of metallic photonic crystals (MPhCs) for high temperature applications, for instance thermophotovoltaic (TPV) energy conversion and selective solar absorption. We begin with the exploration of refractory two-dimensional (2D) MPhC slabs as selective thermal …
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Two classes of unconventional photonic crystals
This thesis concerns two classes of photonic crystal that differ from the usual solid-state dielectric photonic crystals studied in optical physics. The first class of unconventional photonic crystal consists of atoms bound in an optical lattice. This is a "resonant photonic crystal", in which an …
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Photonic crystals : from theory to practice
… explore the design, computation, and analysis of photonic crystals, with a special emphasis on structures and devices that make a connection with practically realizable systems. First, we analyze the properties of photonic-crystal slabs: 2d periodic dielectric structures that have a band gap for …
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Photonic crystals : theory and device applications
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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Optomechanical anisotropy in nanoengineered polymer photonic crystals
Symmetry in photonic crystals is reflected in the structure of their photonic bands and symmetry breaking can result in the development of complete photonic band gaps, leading to enhanced optical properties. This can be difficult for self-assembled nanostructures, due to their restriction by …
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LARGE AREA 3D PHOTONIC CRYSTALS WITH EMBEDDED WAVEGUIDES
… and repeating arrangement of atoms or molecules. Photonic crystals are structures with periodic variations in the dielectric constants that manipulate and control the properties of light propagation. Photonic crystals are analogous to semiconductor crystals with periodic potentials that are …
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Photonic Crystals For Optofluidic Transport, Trapping And Biosensing
Photonic crystals, since their discovery in 1987 have been of great interest to the optics community. Their unique optical properties have revolutionized the field of photonics and have enabled a new class of optical devices with applications in a broad range of areas such as creating nanophotonic …
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Two -Photon Polymerization of Defects in Photonic Crystals
… PBG, it is necessary to convert colloidal photonic crystals to higher refractive index structures that exhibit complete PBGs. To this end, self-assembled photonic crystals with embedded TPP features were replicated in silicon. The TPP features and colloidal crystal served as a template for …
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