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 12 of 12 for “"Fiber taper"”.
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Fiber-taper collected photoluminescence characterization of diamond microdisks
… integrating free space and visible wavelength fiber-taper measurement capabilities is built to characterize diamond microdisk resonators. Using this setup, microdisk wisphering gallery modes with quality factors at visible wavelengths resonant with defect centers as high as Q ∼ 1 × 105, are …
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Optical Sensors for High-Temperature Pressure Measurement and Real-Time Particle Detection
… in real time. The sensor is based on a silica fiber taper, and we aim to detect particle presence by measuring optical scattering and absorption induced by particles attached to the taper surface. To establish the relationship between particle density and optical transmission loss, we first …
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Fabrication of Fluorescent Nanoprobes and Their Applications in Nanophotonics
… of fluorescent nanoprobes consist of a silica fiber taper, a single carbon nanotube, and nanoscale fluorescent elements (such as semiconductor quantum dots). This nanoprobe provides a natural interface between the nanoscale structures (i.e., the fluorescent elements) and the microscale …
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Silica Fiber with Large and Thermodynamically Stable Second Order Optical Nonlinearity
… that, by depositing a regular fused-silica fiber with optical nonlinear molecules, strong and thermodynamically stable SHG can be obtained. Our experiments also provide strong evidence for the theory. Start from the basic Maxwell equation, we derive the SHG efficiency that the excited power …
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Nanophotonic Optomechanical Devices for Torque Magnetometry
… mediated by its evanescent interaction with a fiber taper near-field probe. Strategic fiber taper placement allows for reconfiguration of the dominant optomechanical transduction mechanism and spatially selective optical readout of mechanical resonances such as out-of-plane cantilever modes …
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Optical Resonators and Fiber Tapers as Transducers for Detection of Nanoparticles and Bio-Molecules
… practical transducers demands simpler tools. A tapered optical fiber is a suitable and efficient candidate as a practical tool. In this work, single nanoparticle detection measurements are performed in aqueous solutions and detection limit of fiber taper is investigated.</p>
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Ultra-high-Q Microresonator with Applications towards Single Nanoparticle Sensing
… gased nanoparticle detection techniques: fiber taper detection and resonator reflection mode detection are demonstrated and future implementation on bimolecular detections are discussed.
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Silica Microspheres Functionalized with Self-assembled Nanomaterials
… consist of microspheres fabricated from optical fibers and were coated with a polycation, enabling irreversible nanosphere adsorption. Our results fit well with theory, which predicts that particle adsorption rates depend strongly on surface geometry. This is particularly important for plasmonic …
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Radiation Pressure induced Nonlinearity in Micro-droplet
… optical resonator, where we use an optical fiber taper to couple light into the droplet through non-contact evanescent coupling. The highest Q-factor observed in the experiment is 2x10^7 which closely matches the upper limit of intrinsic Q-factor set by the material absorption. Given with …
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Sensing Applications of Silver and Gold Nanoparticles
… their adsorption process onto PAH-coated optical fiber tapers by monitoring the transmission light through the fiber. When the diameter of the fiber taper gets smaller, stronger coupling occurred between transmitted light inside the taper and the Au NPs on the taper surface (cylinder). This …
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Second Order Nonlinear Silica-Based Fibers and Microspheres
After decades of development, optical fiber technology has reached a high degree of sophistication and maturity, and currently serves as the backbone of today''s internet. Despite its technical versatility and capability, current silica fiber technology still has a significant flaw: since silica …
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Second-Order Nonlinear Optical Responses in Tapered Optical Fibers with Self-Assembled Organic Multilayers
… the critical optical component of a silica fiber cannot to possess a second-order nonlinear optical susceptibility, Χ(²), preventing a silica fiber from many potential applications. Here, we theoretically and experimentally demonstrate a new technique to generate large and thermodynamically …