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 10 of 10 for “"Evanescent fields"”.
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An investigation of phase-mask diffraction patterns and fibre Bragg gratings with scanning near-field optical microscopy
… fibre telecommunications network. By imaging the evanescent fields of Bragg gratings, a characterization technique has been developed which has enabled the acquisition of sub-wavelength information about the optical field distribution within a fibre grating and its refractive index structure. Six …
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Integrated optic/nanofluidic detection device with plasmonic readout
… in the device. Plasmonic devices driven via evanescent fields were designed, simulated, fabricated, and tested in isolation as well as in the integrated system. A sample device was made to demonstrate applicability of this process to direct linear analysis of DNA. The device was shown to …
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Effects of Geometry on Plasmonic Properties of Nanostructures
… trochoid-type field oscillations present in evanescent fields are shown to be responsible for the dramatic response, which opens the door to an entirely new form of dichroism. In summary, we show that metal nanostructures offer a rich platform to study, manipulate, and utilize light …
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Super-Resolution Fluorescence Microscopy using Transparent Waveguide Chips
… at the boundary to the sample medium creates an evanescent field in the sample. This sheet-like illumination only reaches a few hundred nanometers into the sample before decaying, thus achieving axial super-resolution. Although it is usually created by using oil immersion lenses, TIR illumination …
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Acoustic metamaterial design and applications
… of ultrasound. This is due to the quickly fading evanescent fields which carry the subwavelength features of objects. By focusing the propagating wave and recovering the evanescent field, a flat lens with negative-index can potentially overcome the diffraction limit. We present the first …
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Use of Computational Electromagnetics to Enhance the Accuracy and Efficiency of Antenna Pattern Measurements
… from the two components of the measured electric fields. The resultant method of moments matrix equation can be solved very efficiently and accurately by using the iterative conjugate gradient method enhanced through the incorporation of the Fast Fourier Transform techniques. In all these …
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Development of nanoplasmonic devices for biosensing applications
… due to the high sensitivity of the generated evanescent fields to local refractive index changes. However, widespread applications of these sensors are limited due to bulky, high-cost instrumentation requirements and insufficient limit of detection for pertinent cancer biomarker proteins. …
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Development and Optimisation of an Optofluidic Evanescent Field Nano Tweezer System for Trapping Nanometre Crystals for Synchrotron X-Ray Diffraction Experiments
… opening the technique to other research fields, e.g. biomedical, archaeological or engineering. This work focusses on a specific sub-section of the loading challenge, introducing a method which could achieve reliable sample loading of crystals below 5 µm, thus opening up the low micro and …
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Resonant Detection of Nano to Microscopic Objects Using Whispering Gallery Modes
… sensor. Although the resonance is stealth, an evanescent field extends from the microsphere surface the distance of a wavelength into the surrounding medium. This thesis demonstrates how label-free molecules binding to the microsphere surface perturb the optical resonance by interaction with …
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Coupled resonator based wireless power transfer for bioelectronics
<p>Implantable and wearable bioelectronics provide the ability to monitor and modulate physiological processes. They represent a promising set of technologies that can provide new treatment for patients or new tools for scientific discovery, such as in long-term studies involving small animals. As …