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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 148 for “"Evanescent"”.
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Laterial resolution enhancement with standing evanescent waves
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Development of the Evanescent Wave Atomic Force Microscope
… provide real time separation information. The evanescent wave atomic force microscope (EW-AFM) utilizes a second, independent detection system to determine absolute probe-surface separation in real time. The EW-AFM can simultaneously acquire real-time force and probe-sample separation …
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Optimising the plastic optical fibre evanescent field biofilm sensor
… plastic optical fibre (POF) sensors using evanescent field modulation. The exposed polymethylmethacrylate (PMMA) core of the POF fibre forms the sensor interface that detects refractive index changes of a measurand acting as the cladding. When a liquid measurand is used, the sensor can …
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Two Studies in Evanescent Wave Propagation (Beam, Acoustic, Gaussian)
Two problems are studied in this dissertation. In the first problem, surface motion, excited by acoustic emissions produced by fracture processes at the edge of a buried, penny-shape crack, are investigated. First, wave-front approximations to the emissions generated by the sudden growth of a …
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Evanescent field enhanced fluorescence on a photonic crystal surface
Photonic crystal (PC) surfaces have been demonstrated to be a compelling platform for improving the sensitivity of surface-based fluorescent assays used in disease diagnostics and life science research. PCs can be engineered to support optical resonances at specific wavelengths at which strong …
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CHARACTERIZATION OF LONG PATHLENGTH CAPILLARY WAVEGUIDES FOR EVANESCENT FLUORESCENCE APPLICATIONS
… for fluorescence spectroscopy were evaluated. Evanescent fluorescence from samples in the FOCap was measured by coupling the FOCap to a light source and a fluorescence spectrophotometer. The FOCap has negligible excitation light loss over long lengths (20 m or more) for a range of wavelengths. …
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CHARACTERIZATION OF LONG PATHLENGTH CAPILLARY WAVEGUIDES FOR EVANESCENT FLUORESCENCE APPLICATIONS
… for fluorescence spectroscopy were evaluated. Evanescent fluorescence from samples in the FOCap was measured by coupling the FOCap to a light source and a fluorescence spectrophotometer. The FOCap has negligible excitation light loss over long lengths (20 m or more) for a range of wavelengths. …
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Investigation into the fundamental principles of fiber optic evanescent sensors
… concerned with the development of a fiber optic evanescent sensor. Such a sensor is based upon the lateral regions of the waveguide and their interaction with a chemical environment. The basic principles and concepts involved in the construction of a fiber optic spectroscopic evanescent field …
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Thin film integrated optical waveguides for biosensing using local evanescent field detection
… the core of the waveguide is a decaying evanescent light field that extends into the cladding layers. The intensity profile of the evanescent field is dependent on the refractive index of the cladding. The changes in the local intensity of the evanescent field can be used to detect …
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Super-resolution wide-field optical microscopy by use of Evanescent standing waves
… the excitation wavelength by utilizing an evanescent standing wave, carrying high spatial frequency information near the interface between the specimen and a high refractive index substrate. Evanescent standing wave illumination is used to generate a sinusoidal, high-spatial frequency, …
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Evanescent wave spectroscopy for detection of water and water treeing in polymers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Investigation of Non-DLVO Forces using an Evanescent Wave Atomic Force Microscope
… new methods for measuring surface forces using evanescent waves, and applications to non-DLVO forces. An evanescent wave, generated at a solid-liquid interface, is scattered by AFM tips or particles attached to AFM cantilevers. The scattering of this wave is used to determine absolute separation …
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Composite Films for Modifying Evanescent Wave Characteristics in Long-Period Grating Biosensors
… Microscopy. The affinity film was probed by an evanescent wave to detect changes in refractive index due to the binding of anti-BSA IgG. Under these conditions, the sensor yielded a signal ratio of approximately 10-4 refractive index units per nm signal. Reproducible binding was shown over …
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Evanescent Wave Reduction Using a Segmented Wavemaker in a Two Dimensional Wave Tank
Evanescent waves are created by the wavemaking process during tank testing. They have long been a nuisance for engineers as they contaminate the wave field in the tank and result in additional inertial force experienced by a wavemaker. Evanescent waves are created by the mismatch between the motion …
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Evaluation of a planar optic waveguide as a platform for evanescent field chemical sensor development
… interfacial sensitivity of the device for evanescent field chemical sensor development in the visible spectral region. However, it was discovered that selective prism and grating coupling to discrete waveguide modes was not possible due to strong crosstalk between modes in multiple mode …
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Application of Complex Ray Tracing to the Scattering of an Evanescent Plane Wave by a Conducting Circular Cylinder
Made available in DSpace on 2014-12-10T19:07:27Z (GMT). No. of bitstreams: 1 7511700.pdf: 2058102 bytes, checksum: b4c7793a1ac3a952979a3deb3c014544 (MD5) Previous issue date: 1974
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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
… system which combines the advantages of both evanescent field optical tweezing and microfluidics. A low cost commercial Nanotweezer system and optofluidic chip technology were assessed via interferometry and SEM microscopy to determine the microfluidic and waveguide architecture. It was shown …
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