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 18 of 18 for “"evanescent waves"”.
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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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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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Effective development of cylindrical finite-difference time-domain for electromagnetics applications
… is capable (when fully implemented) of absorbing evanescent waves by shifting the frequency poles in the imaginary axis. Such evanescent waves exist in cylindrical structures near the axis of rotation and need to be effectively absorbed if the CFDTD model is to be truncated within this region. …
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Transmission and reflection properties of layered left-handed materials
… relative amplitudes of the growing and decaying evanescent waves inside the LHM slabs. The energy flux patterns within LHM slabs are further studied to show the influence of the evanescent waves on the GH shift direction change.
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Anomalous photon phenomena in electromagnetic crystal systems
… all incident directions. Second, transmission of evanescent waves through electromagnetic-crystal slabs is studied, and a general result is established linking bound slab resonance states to an amplification effect of evanescent waves.
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Coherence Properties Of Optical Near-fields
… theory disregard the contribution of short-range evanescent waves. Nonetheless, the specific features of random fields at subwavelength distances from interfaces of real media are influenced by the presence of evanescent waves because, in this case, both propagating and nonpropagating components …
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Analysis and Experimental Investigation of Wave Propagation and Energy Transfer in Mechanical Rotator Metamaterials
… and manipulating the propagation of waves and energy transfer in engineered materials characterized by periodic arrangements of unit cells. This organized arrangement governs wave behavior, imparting dispersive characteristics and frequency band structures, thereby inspiring the …
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Studies on Low Frequency Fast Multipole Algorithms
… the transition region around 0.1 wavelength. Evanescent waves and propagating waves are both used to compensate for the accuracy lost in the conventional translation process. The scale invariance of LF-FIPWA is studied in detail to preserve the basic Laplace equation property. To improve the …
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Near-field scanning optical microscopy with laser trapping
… in that it relies on the collection of scattered evanescent waves from a sample with a laser-trapped particle. In comparison with the other forms of near-field scanning optical microscopy with a tapered fibre or a metallic needle probe, particle-trapped near-field scanning optical microscopy …
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Emission source microscopy for electromagnetic interference source localization
… close to the PCB. In the near-field, the evanescent waves are dominant, which may lead to the misinterpretation of them being the dominant sources contributing to the far-field. Another limitation of near-field scanning is that the probe may not be able to access all locations near the PCB …
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Remote sensing of submerged objects and geomorphology in continental shelf waters with acoustic waveguide scattering
… for coherent returns from the scattering of evanescent waves by extended but discrete sub-bottom geologic features to stand significantly above diffuse or incoherent returns arising from small-scale roughness of the waveguide boundaries. A long-range bistatic sonar system was deployed in a …
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ANALYTICAL APPLICATIONS OF SURFACE-MODIFIED FUSED SILICA CAPILLARIES
… (AChE) to the surface and using evanescent waves to monitor the enzyme activity. The hypotheses for the chemical sensor are that the improved enzyme activity of a recombinant AChE, along with the improved sensing capabilities of the fiber optic capillaries, will improve detection …
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ANALYTICAL APPLICATIONS OF SURFACE-MODIFIED FUSED SILICA CAPILLARIES
… (AChE) to the surface and using evanescent waves to monitor the enzyme activity. The hypotheses for the chemical sensor are that the improved enzyme activity of a recombinant AChE, along with the improved sensing capabilities of the fiber optic capillaries, will improve detection …
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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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Graphene Based Metamaterials For Terahertz Cloaking And Subwavelength Imaging
… the proposed lens depends on the enhancement of evanescent waves, wherein the excited surface plasmons at the lower and upper graphene interfaces are coupled by an array of metallic wires. The resolution and the operating frequency of the subwavelength imaging device are mainly determined by the …
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Investigations on the development of a novel hybrid sensor for environmental monitoring applications.
… sensor has been developed using the phenomena of evanescent waves in optical fibre with dithizone to detect heavy metal ions. A U-bent sensor geometry has been investigated to enhance the optical sensitivity of the sensor through higher evanescent field near the surface. Further, optical field …
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Inverse techniques: problems in optics and gas sensing
… the diffraction limit: superresolution and evanescent waves. In chapter 5 we investigate the application of inverse techniques to calculating phase patterns which produce superresolution optical traps. We calculate theoreti- cally the improvements to both relative trap stiffness and trap …
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Divergence Model for Measurement of Goos-Hanchen Shift
In this effort a new measurement technique for the lateral Goos-Hanchen shift is developed, analyzed, and demonstrated. The new technique uses classical image formation methods fused with modern detection and analysis methods to achieve higher levels of sensitivity than obtained with prior …