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 20 of 1137 for “"photonic"”.
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On-chip silicon based photonic structures : photonic band gap and quasi-photonic band gap materials
This thesis focuses on integrated silicon based photonic structures, photonic band gap (PBG) and quasi-photonic band gap (QPX) structures, which are based on high refractive index contrast dielectric layers and CMOS compatibility. We developed a new type of silicon waveguide - Photonic Crystal (PC) …
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Ordered photonic microstructures
This thesis examines novel photonic materials systems possessing order in the atomic, microscopic, and macroscopic dimensional regimes. In the atomic order regime, a structure-property investigation is done for Er203 in which the first report of room temperature photoluminescence (PL) is provided. …
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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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Photonic RF signal processors
… activities include design and modelling of novel photonic architectures for processing and filtering of RF, microwave and millimeter wave signals of the above mentioned applications. Investigations especially focus on two basic functions and critical requirements in advanced RF systems, namely: • …
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Integrated Inp Photonic Switches
Photonic switches are becoming key components in advanced optical networks because of the large variety of applications that they can perform. One of the key advantages of photonic switches is that they redirect or convert light without having to make any optical to electronic conversions and vice …
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A Photonic Quantum Sensor
This thesis characterizes a quantum node comprising an atom and a microresonator. The electric field of the microresonator is simulated using the finite element method. An approximating analytical solution of the microresonator is proposed and compared to the finite element method simulation. …
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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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Advanced silicon photonic modulators
… integration with modern electronic devices. Photonic crystal structures, which promise smaller footprint sizes and lower power requirements, are also investigated, but it proves difficult to obtain a physically feasible design. Finally, a linearization scheme for Mach-Zehnder modulators is …
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Periodic subwavelength photonic structures
… wavelength-dependent back-scattering off of a photonic crystal resonant cavity. The challenge is that we want to observe high quality factor resonant peaks while reducing the size of the crystal to less than 10 microns. So far the highest quality factor observed was about 800. The third …
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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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One-dimensional photonic crystal / photonic wire cavities based on silicon-on-insulator (SOI)
… The combination of one-dimensional photonic crystal structures (PhC) and narrow photonic wire (PhW) waveguides in high refractive-index contrast materials such as silicon-on-insulator (SOI) is one of the main contenders for provision of various compact devices on a single chip. This …
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Next-Generation Photonic Signal Processors
… to wiring capacitance and transistor leakage. Photonic processors, leveraging light, are devoid of these effects and utilize wavelength-division multiplexing for increased throughput and energy efficiency. Yet, their WDM scalability is limited by the free spectral range (FSR) of photonic …
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Microscopic characterisation of photonic devices
The work presented in this thesis sets out to explore the optical properties of optical fibres by means of non-invasive microscopic techniques such as Differential Interference Contrast (DIC) microscopy. It seeks to provide the fibre optic industrial and research community with an alternative tool …
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Tunable Liquid Crystal Photonic Devices
… processing, optical interconnections, photonics, integrated optics, and optical communications due to their tunable optical properties. In this dissertation, we describe novel liquid crystal photonic devices and their fabrication methods. The devices presented include inhomogeneous …
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Optimization of Photonic Crystal Structures
… method for improving the performance of photonic crystal structures. Possible future research directions and applications are also briefly discussed.
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