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 15 of 15 for “"photonic crystal fibers"”.
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Single Crystal Sapphire Photonic Crystal Fibers
A single crystal sapphire optical fiber has been developed with an optical cladding that is used to reduce the number of modes that propagate in the fiber. This fiber is the first single crystal sapphire photonic crystal fiber ever produced. Fabrication of the optical cladding reduces the number of …
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Ultrafast optical pulse manipulation in three dimensional-resolved microscope imaging and microfabrication
… two-photon excitation microscopy. First, optical fibers are routinely used in many optical instruments but their use in two-photon microscopy is very limited. As ultrafast light pulses propagate through conventional fiber optics, light pulses are dispersed and broadened, as a result of nonlinear …
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Modeling of nonlinear ultrashort optical pulse propagation
… instability in Kagome-type hollow-core photonic crystal fibers.
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Power scaling and nonlinear conversion in fiber-based sources at novel wavelengths
… regions of available rare-earth-doped gain fibers through nonlinear conversion processes can push the current silica-based fiber laser technology and enable further applications in imaging, communication, and material processing. This dissertation focuses on different ways to increase the …
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Advanced light manipulation and waveguiding in plasmonic nanostructured optical fibers.
Conventional optical fibers are well-known for their efficient light guiding mechanism. However, the dielectric properties of core and cladding materials (e.g.- doped silica and silica glasses) limit the functionality of the optical fibers. Therefore, the optical properties of the fibers, such as …
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Wave propagation and imaging in structured optical media
… telecommunications by microstructured photonic crystal fibers, to invisibility cloaking, to super-resolution imaging with metamaterials etc.</p> <p>In particular, structured optical media allow to manipulate the wave propagation and dispersion. In this thesis, we focus on engineering …
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Using saturated absorption spectroscopy on acetylene-filled hollow-core fibers for absolute frequency measurements
… to date have occurred in free-space. Hollow-core photonic crystal fibers offer a potential alternative to free-space setups through their small cores (~10’s of µm) and low-loss guidance. Furthermore, HC-PCF can be made into fiber cells that could be directly integrated into existing …
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Fabrication of Random Hole Optical Fiber Preforms by Silica Sol-Gel Processing
Conventional fibers are comprised of a solid glass core and solid glass cladding often protected by a thin polymer sheath. The finely tuned difference in refractive indices, for step index-fibers, is achieved by doping the core with germanium or elements with similar effects. Holey fibers …
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Analysis and Applications of Microstructure and Holey Optical Fibers
Microstructure and photonic crystal fibers with periodic as well as random refractive-index distributions are investigated. Two cases corresponding to fibers with one-dimensional (1D) radial index distributions and two-dimensional (2D) transverse index distributions are considered. For 1D …
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Numerical and Analytical Studies of Electromagnetic Waves: Hermite Methods, Supercontinuum Generation, and Multiple Poles in the SEM
… we analyse the generation of supercontinua in photonic crystal fibers. We depart from the commonly used approach where a Taylor series expansion of the propagation constant is used to model the dispersive properties in a generalized nonlinear Schrodinger equation (gNLSE). Instead, we develop a …
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Modeling and Analysis of Photonic Crystal Waveguides
In this work, we investigate several aspects of photonic crystal waveguides through modeling and simulation. We introduce a one-dimensional model for two-dimensional photonic crystal fibers (PCFs), analyze tapered PCFs, analyze planar photonic crystal waveguides and one-dimensional PCFs with …
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Hierarchical Semiconductor, Metal and Hybrid Nanostructures and the Study of their Light-matter Interactions
… be in agreement. 3) The efficacy of hollow core photonic crystal fibers (HCPCF) as a platform for SERS spectroscopy was demonstrated. SERS measurements carried out using this platform showed the capability to monitor minute amounts of ligands on the surface of gold nanoparticles and SERS signals …
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Measuring the Frequency of Light using Femtosecond Laser Pulses
… suited for such massive broadening are so called photonic crystal fibers. Here the light is guided in a very small core (1-2 µm) surrounded by air holes. This development culminates in the “single laser frequency chain” linking the radio frequency domain with the optical domain with the help of …
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Optical diagnostics for oral and gastrointestinal tract pathologies
… analysis of liquid saliva was advanced using photonic crystal fibers (PCFs), which amplify Raman signals to detect subtle biochemical markers in real-time. This enabled label-free, point-of-care screening that complements tissue diagnostics. Together, these techniques create a clinically …
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Příprava a testování SNOM sond speciálních vlastností
Fotonická krystalická vlákna (PCF) představují slibný nástroj pro spojení technik známých z mikroskopie rastrovací sondou, elektronové mikroskopie a systémů pro vstřikování plynu. Přivedení světla a přenos pracovního plynu současně do blízkosti vzorku umístěného uvnitř elektronového mikroskopu …