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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 27 for “"whispering gallery mode"”.
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Whispering gallery mode microcavities: from fabrication to applications
… cooling works of a microsphere pendulum using a whispering gallery mode (WGM) cavity-based photonic molecule scheme. In the course of implementing this scheme, microcavity devices, such as microspheres and microbubbles were studied for topics as diverse as optomechanics, photonics, laser tuning …
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Embedded Sensing System for Whispering-Gallery-Mode Optical Resonators
Whispering-gallery-mode (WGM) optical resonators in which light is confined by total internal reflection have found broad applications ranging from optical communications, microlasers, sensing, opto-mechanics to quantum optics. However, overcoming obstacles of practical applications for WGM …
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Design and Analysis of Whispering Gallery Mode Semiconductor Lasers
Significant technical barriers currently prevent the wide spread adoption of WGM lasers as building blocks in large-scale photonic integrated circuits. The first challenge is to reduce the electrical power consumption at desirable levels of light output power. The second target is to obtain …
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Non-Hermitian Whispering Gallery Mode Optical Microresonators and Their Applications
<p>Whispering-gallery-mode (WGM) optical microresonators, in which light propagates along the circular rims due to the total internal reflection, have attracted broad attention in the past two decades. Owing to the ultrahigh quality factor and the small mode volume, WGM resonators can significantly …
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Optical Fiber Microstructures for Self-Contained Whispering Gallery Mode Excitation
… of these attractive features to their support of whispering gallery mode (WGM) resonances. The sensitivity of a resonance's frequency and Q to strain, temperature, and other parameters of the surrounding medium can be the basis for ultracompact modulators and sensors. Physically, WGMs are special …
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Whispering-gallery-mode dye laser emission from liquid in a capillary fiber
The nature of optical whispering-gallery-mode resonances in a layered microcylinder is investigated numerically by studying the scattering characteristics and the internal electromagnetic fields of a normally-illuminated cladded dielectric fiber calculated using the boundary-value method. Computed …
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Integrating nanostructured artificial receptors with whispering gallery mode optical microresonators via inorganic molecular imprinting techniques
… loss of device performance. Silica microsphere Whispering Gallery Mode optical microresonators are coated with a silica thin film templated by a small fluorescent dye, fluorescein isothiocyanate, which serves as our model target. Oxygen plasma degradation and solvent extraction of the template …
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Early Diagnosis of Alzheimer's Disease and Studying Binding to Opioid Receptors using Whispering Gallery Mode Microtoroid Biosensors
Due to their high quality factor, whispering gallery mode (WGM) optical biosensors offer several advantages over other biosensors including higher sensitivity and label-free capability. At the resonance condition, light circulates within the perimeter of the WGM resonator by total internal …
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Design, fabrication, and characterization of lithium niobate whispering-gallery-mode microdisk and microring resonators and grating couplers
… provides preliminary characterizations of LiNbO3 whispering-gallery-mode microring and microdisk resonators, a single-ring filter, and grating couplers. The theory, simulation, fabrication, and experimental results of these devices are presented. Fabricated grating couplers with center wavelengths …
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Design, fabrication, and characterization of a lithium niobate optomechanical photodetector based on released whispering-gallery-mode microdisk resonators
… Lithium Niobate platform using a combination of Whispering-Gallery-Mode (WGM) micro-disk optical resonators and suspended RF MEMS acoustic resonators. The fundamental idea behind this device is changing the device’s measured impedance by shifting the resonance frequency of the acoustic resonator, …
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Femtosecond-Laser-Enabled Fiber-Optic Interferometric Devices
… fiber-tip Fabry-Pérot cavity, and in-fiber Whispering-Gallery mode resonator
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Ultra-high-Q Microresonator with Applications towards Single Nanoparticle Sensing
Whispering-gallery mode microcavities confines light and enables enhanced light-matter interaction. They are great platforms for enhanced light-matter interactions. Using ultra-high-Q microtoroids and focusing on a phenomenon called mode splitting, we demonstrate the theory and experiments for …
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The physics and chemistry of semiconductor nanocrystals in sol-gel derived optical microcavities
… to spherical microresonators exhibiting whispering-gallery mode lasing. Chapter 4 compares and explicates the differences between silica and titania as host matrices for NCs in terms of their chemical stability in the presence of solvents.
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Frequency-tunable second-harmonic submillimeter-wave gyrotron oscillators
… generated 19 W of power in a cylindrical TE4,3,q mode from a 13-kV 190-mA electron beam. The minimum start current was measured to be 21 mA, where good agreement was verified between the measured start current values and the calculation from linear theory for the first six axial modes, q = 1 …
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Nonreciprocal coupling to microstrip resonators
… traveling wave bias to scatter light between two modes which differ in frequency and momentum. Due to momentum conservation, this process is inherently nonreciprocal --- light traveling in different directions will be scattered differently by the traveling wave bias. This thesis extends the method …
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Lightwave circuits for integrated Silicon Photonics
… the integration of a hybrid III-V-silicon mode-locked laser has also been studied. During this study, technological novelties have also been developed by modelling the wedge profile obtained during the wet etching of silicon glass materials to engineer 3D structures. In parallel, the …
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VUV 157nm F₂ laser irradiation of micro- and nano-scale particles
… mass loss through heating.Finite Element Method modelling is used to investigate and support the experimental results.Fluorescent polystyrene particles are also irradiated at a wavelength of 157nm. They retain their fluorescence after irradiation and exhibit Whispering Gallery Mode resonances, …
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High Resolution Distributed Sensing Using Exposed-Core Fibres
… to two dimensions are detected using the few-mode property of the ECF. The size characterisation of micro-scaled particles has also been demonstrated using machine learning algorithms based on the multimode property of the ECF. The ECF OFDR platform is also demonstrated as a useful tool for …
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Manufacturing and aerostatic tunability of opto-mechano-fluidic resonator and its application in viscosity sensing
… experiments parametrically couple the phonon modes and photon modes in microresonators and various optical systems have been investigated. However, because of the increased acoustic radiative losses during direct liquid immersion of optomechanical devices, almost all published optomechanical …
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