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 29 for “"guided mode"”.
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Design of Submicron Structured Guided-Mode-Resonance Near-Infrared Polarizer
… TM polarizer, were designed using the guided-mode-resonance filter. The Au wire-grid TM polarizer of 700nm grating width and 1200nm grating period has 95% transmittance at 2400nm, more than 1000nm resonance peak bandwidth, and an extinction ratio (ER) of around 300 with a moderated …
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Guided -Mode Resonance in Planar Photonic Crystals: Application to Sensing
… of planar photonic crystals that employ the guided-mode resonance effect for sensing and detection applications. A theoretical basis for these applications is first developed, followed by the demonstration of a near-ultraviolet reflectance filter that provides high reflection efficiency in …
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Integrated narrowband guided mode resonance photonic filters for advanced mid-infrared microspectroscopy
… by using photonic filtering that is based on guided mode resonance (GMR). First, a useful analytical framework for optimal design of GMR devices is established based on a sound understanding of the underlying physics, and can be used to complement numerical electromagnetic simulations. Then, …
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Design and fabrication of a single-layer guided mode resonance grating transmission filter
… analyzer is envisioned. The device uses the guided-mode resonance effect, which has been used in the past to make optical stopband filters that only reflect a very narrow range of wavelengths. It has been shown that these filters can be designed to reflect an arbitrarily narrow range of …
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Development of hollow-core photonic bandgap fibres free of surface modes
… now been affected by the existence of surface modes. These surface modes couple with the air-guided mode in specific spectral ranges inside the bandgap simultaneously increasing the attenuation and dispersion of the air-guided mode and reducing the useable bandwidth of the fibre. Therefore, for …
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Cylindrical photonic crystals
… low index of refraction region, and to work with guided modes whose dispersion relations lie above the light line of air, in a region where the longitudinal wave vector of the guided mode can approach zero. Chapter 2 discusses hollow-core photonic band gap fibers that can transmit light with …
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Cavity coupled photonic crystal enhanced fluorescence for high sensitivity biomarker detection
… expected to increase the quality factor of the guided mode optical resonator in the photonic crystal improving the mechanism of enhanced excitation acting on the fluorophore. The mirror is also expected to improve the mechanism of enhanced extraction by redirecting the emitted light from the …
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An experimental and theoretical investigation of waveguide scatter, with applications to solution-deposited silica-titania planar waveguides
… systems. A perturbation theory was used to model TE₀ mode scattering from surface and volume microstructure, and to predict attenuation when provided with the necessary waveguide and scattering parameters. Final forms for the equations predicting surface and volume scatter losses into the …
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An investigation of optical properties in active and passive nanophotonic devices
… losses driven by surface plasma polariton and guided mode in OLEDs. Particularly, a novel polarized OLED structure based on photo cross-linkable luminescent mesogenic EML material is reported.<br/><br/>The passive device part introduces the development of a symmetrical dual-sweep source for the …
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Silicon based photonic crystal coupled to an optical cavity for highly sensitive biodetection
… surface-bound fluorophores. When the resonant guided mode condition is reached, PCs provide fluorescence enhancement mainly through two mechanisms: enhanced excitation and enhanced extraction. This thesis addresses the design, fabrication, and characterization of a silicon based PC coupled to …
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Design And Optimization Of Nano-optical Elements By Coupling Fabrication To Optical Behavior
… last decade, largely due to improved numerical modeling and advances in fabrication technologies. To this day, fabrication and optical behavior remain decoupled during the design phase and numerous assumptions are made about "perfect" geometry. As research moves from theory to real devices, …
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Post-growth spectral tuning of InGaAs/GaAs quantum dot infrared photodetectors
… are essential in many industries and modern applications require devices with enhanced capabilities. High-performance detectors can be used for spectroscopy in medicine and environmental monitoring. Imaging scenarios include the identification of military targets and predicting …
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Post-growth spectral tuning of InGaAs/GaAs quantum dot infrared photodetectors
… are essential in many industries and modern applications require devices with enhanced capabilities. High-performance detectors can be used for spectroscopy in medicine and environmental monitoring. Imaging scenarios include the identification of military targets and predicting …
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Nanostructured Devices for Ultrasensitive and High Throughput Vibrational Spectroscopic Imaging
… in mid-infrared spectral regions using guided mode resonances is demonstrated. The design principles and methodology presented in this dissertation are expected to provide a rational approach in development of sets of probes and filters to enable rapid, ultrasensitive acquisition of …
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Electromagnetics in characterizations
(cont.) Characterization of the differential guided mode of a coupled-strip transmission line allows us to understand its behaviors in high frequency circuit applications. S-parameters of the differential mode of a coupled-strip transmission line on a multi-layer silicon substrate extracted from …
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Analytical Modeling of Waveguide-fed Metasurfaces for Microwave Imaging and Beamforming
… an array of metamaterial elements excited by a guided mode. When the metamaterial elements are excited, they in turn leak out a portion of the energy traveling through the waveguide to free space. As such, a waveguide-fed metasurface acts as an antenna. These antennas possess a planar form …
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Corrosion detection using metal coatings on fiber optic sensors
… as bandstop filters, by coupling the fundamental guided mode to circularly symmetric cladding modes. The cladding modes are extremely lossy due to the fiber jacket and bending along the fiber. Losses at discrete wavelengths can be monitored to determine the onset and progress of metal corrosion. …
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Parity-time and supersymmetry in optics
… offers a new method for achieving single mode operation in laser cavities. Other interesting phenomena also arise in connection with PT periodic structures. Along these lines, we introduce a new class of optical lattices, the so called mesh lattices. Such arrays provide an ideal platform …
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Bioimaging with photonic crystal enhanced microscopy
… biological samples. Photonic crystal, supporting guided-mode resonances and providing local optical modes, can enhance the light-matter interaction on its surface and thus used for label-free detection and biosensing. One dimensional photonic crystal surfaces are designed and utilized as a …
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Properties and sensing applications of long-period gratings
… condition causes light from the fundamental guided mode to couple to discrete, forward-propagating cladding modes. These cladding modes attenuate rapidly on propagation and result in loss bands at distinct wavelengths in the grating transmission spectrum. We present a comprehensive analysis …
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