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 20 of 494 for “"near field"”.
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Investigation of optical near field using near field scanning optical microscopy
… demand a new tool for characterization. The Near Field Scanning Optical Microscopy (NSOM) has been developed to tackle certain aspects of this problem. The work presented here applies different types of NSOM to explore the near field distribution of metal plasmonic nanostructures.^ Ridge …
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Near-field auditory localization
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Scanning near-field photon emission microscopy
… of fault isolation techniques, like far-field photon emission microscopy (FFPEM), is grossly inadequate for advanced semiconductor technology nodes beyond 65 nm. The fundamental limit on spatial resolution of FFPEM is approximately half the wavelength of the detected photons. The …
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Near-field imaging with terahertz pulses
… is implemented with a novel collection mode near-field terahertz (THz) probe. Exceptional sensitivity of the probe allows imaging with spatial resolution of few microns using THz pulses with spectral content of 120 to 1500 microns. In the present study, the principle of the probe operation as …
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Near-field radiation in nanoscale gaps
The theoretical calculations for near-field radiation heat transfer based on a local dielectric constant approach indicate that the heat transfer will go to infinity as the gap becomes very small. To correct this anomaly, it has been proposed that the heat transfer through very small gaps will …
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Building practical apertureless scanning near-field microscopy
… functional, practical apertureless type scanning near-field optical microscope, and to figure out the working mechanism behind it. Whereas a far-field microscope can measure the propagating field’s components, this gives us little information about the features of the sample. The resolution is …
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Optimisation of a Near-Field Scanning System
In this thesis, the optimisation of a near field scanning system is discussed. This system, which consists of a stationary transmitter and a movable receiver, is in use in the Experimental Physics Department at NUI Maynooth. The position of the receiver is controlled by a two axis mechanical …
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Control and quantification of near-field electromagnetics
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01
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Near field behavior of reacting free jets
… reacting elliptical jets have been completed. Linear stability analysis was used to force the jets at their most amplified frequency. Circular jet simulations showed low levels of coherent structure formation and little oxidizer entrainment. The nonreacting elliptical jet exhibited out-of-plane …
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Near-field scanning optical microscopy with laser trapping
… comprehensive understanding of particle-trapped near-field scanning optical microscopy. This technique is unique 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 …
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Near-Field Scanning Optical Tomography: Theory and Modalities
Other possible modalities of NSOT are investigated. An experimental configuration with three-dimensional volumetric scan of the probe is studied for the possibility of a tomographic imaging with a fixed-angle illumination. Alternatively, a broadband illumination with one fixed angle or a limited …
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Near-Field Focusing Phased Array for Hyperthermia Application
… and less surface heating for achieving the same field intensity at the tumor, (ii) deeper penetration depth as the propagation loss in the human body is partially compensated by the beam focusing effect, and (iii) smaller and electronically scannable 3 dB spot.
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Impulse loading of near-field shallow-buried explosions
Prediction of the total impulse for a mine-protected vehicle must be empirically determined for South African Paardefontein soil pit soil at the start-up phase of a new vehicle project, particularly when experimental data are not yet available for the calibration of computational efforts. The total …
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Development of a multipurpose near-field imaging platform
… techniques has been revolutionizing for multiple fields - Condensed Matter Physics, Material Science, Chemistry, and Biology. This high potential is met with the special requirements of sub-nanometer SPM, and the resulting instrument is usually sophisticated, expensive, and requires continuous …
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Performance analysis for near-field atmospheric optical communications
… optical links are set up to operate in the far-field power transfer regime, in which diffraction spread is the dominant effect on the beam. Therefore, a very small portion of the beam is captured at the receiver, resulting in very weak power coupling between the transmitter and the receiver. …
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An Improved dipole-moment model based on near-field scanning for characterizing near-field coupling and far-field radiation from an IC
… an improved IC radiated emission model based on near-field measurements is proposed. The regularization technique and the truncated SVD method are employed together with the least square method to calculate the dipole moments from the near-field data. This dipole model has clear physical meaning: …
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Nanoscale investigation of silk proteins using near-field optics
… or limited spatial resolution (for example, ‘far-field’ infrared (IR) spectroscopy). In this context, my research focuses on the understanding of the conformational transitions of silk fibroin and recombinant spider silk, and the interaction between the protein and energy or other biomolecules at …
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Near Field Scanning Optical Microscopy (NSOM) of nano devices
… of nano-devices using the technique of Near-Field Scanning Optical Microscopy (NSOM). A unique setup to perform Atomic Force Microscopy (AFM) and NSOM simultaneously in a scanning electron microscope (SEM) to collect spatially resolved luminescence and image transport on nano-scale …
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Characterising nonlinear waveguides by scanning near-field optical microscopy
Scanning near-field optical microscopy (SNOM) has been applied to investigate the dispersion and nonlinear phenomena in a multimode Ta2O5 rectangular waveguide. Unlike the conventional approach of observing only the output spectra, the SNOM technique can collect the localised spectra from the …
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Scattering Scanning Near-Field Optical Microscopy on Anisotropic Dielectrics
Near-field optical microscopy allows the nondestructive examination of surfaces with a spatial resolution far below the diffraction limit of Abbe. In fact, the resolution of this kind of microscope is not at all dependent on the wavelength, but is typically in the range of 10 to 100 nanometers. On …
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