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 17 of 17 for “"Near Fields"”.
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Locally finite near-fields
A near-field is locally finite if every finite subset of it generates a finite sub-near-field. The main aim of this thesis is to give a coherent account of locally finite-near-fields, including finite ones. The well known results for finite near-fields are lised and proofs are given where …
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Locally finite near-fields
A near-field is locally finite if every finite subset of it generates a finite sub-near-field. The main aim of this thesis is to give a coherent account of locally finite-near-fields, including finite ones. The well known results for finite near-fields are lised and proofs are given where …
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Coherence Properties Of Optical Near-fields
… In this dissertation, concepts specific to near-field optics and experimental capabilities specific to near-field microscopy are used to investigate various aspects of the statistical properties of random electromagnetic fields in the vicinity of optically inhomogeneous media which emit or …
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Coherence Properties Of Optical Near-fields
The National Science Education Standards (1996) support inquiry-based instruction. According to the National Science Education Standards. When children or scientists inquire into the natural world they: ask questions, plan investigations and collect relevant data, and organize and analyze collected …
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Near-field scanning study for radio frequency interference estimation
… discusses the novel techniques using near-fields scanning to do radio frequency interference (RFI) estimation. As the electronic products are becoming more and more complicated, the radio frequency (RF) receiver in the system is very likely interfered by multiple noise sources …
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Active control of flexural power flow in elastic thin beams
… as discontinuity impedance and effects such as near fields, number and location of control actuators and error sensors is investigated and discussed. The mechanisms by which control is achieved are considered. It is demonstrated that the boundary conditions and the system configuration strongly …
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Retrieval of equivalent currents by the use of an integral representation and the extinction theorem --- radome applications
… surface currents on its surface from measured near fields. It is shown how the radome interacts with the field, creating beam deflection, pattern distortion, etc. The phase shift of the field due to the transmission through the radome, i.e., the insertion phase delay, is visualized. …
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Time-Resolved Interactions of Infrared Vibrations and Plasmonic Nanogaps
… study of vibrational dynamics within plasmonic near-fields across a wide range of timescales, capturing ultrafast vibrational decay and microsecond thermal dissipation within nanoscale metal-molecule junctions. Novel spectroscopy approaches are developed which combine resonant mid-infrared (MIR) …
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The application of wave based techniques to intensity measurement in beams and plates
… the far field and in regions where one and two near-fields exist. Different arrangements of transducers are compared in terms of the conditioning of the problem of estimating wave amplitudes from measured variables. It is shown that the choice of measured variables has an effect on the …
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FDTD Analysis of Plasmonic and Nanojet Enhanced Photodetectors for Improved Performance
… especially where geometrical complexities, nonlinearities and multiphysics dominate. In this thesis, novel photodetectors are developed via FDTD having sub-wavelength active areas that yield enhanced optical absorption at near-infrared (NIR) wavelengths by way of plasmonics or photonic nanojets. …
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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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Nonreciprocal and Exotic Radiative Transfer in Type-I Magnetic Weyl Semimetals
… in planar configurations in the far- and near-fields. First, we demonstrate that a planar interface between air and a Weyl semimetal can intrinsically violate Kirchhoff’s law of radiation, and that nonreciprocal surface plasmon polaritons (SPPs) excited on this interface drive the …
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Nanoscale light-matter interaction of ultrathin materials
… interactions in such hybrids when electric fields approach the nanoscale, where classical and local electrodynamics give way to quantum and nonlocal material responses. We begin by deriving the optical response from the Heisenberg equations of motion, self‐consistently coupled to Maxwell’s …
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Toward spatial control of gold nanorod surface functionalization
… to probe the TPA enhancement. The intrinsic nonlinear optical properties of GNRs is shown to contribute strongly to these measurements, suggesting the utility of these materials for bi-modal imaging platforms. GNR properties, like their shape, are anisotropic. The LSPR-induced near- fields are …
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Developments in time-resolved ultrafast imaging and spectroscopy at terahertz frequencies
… is needed for studying very fine structures and near-fields in the THz regime, and a lowest noise floor of 0.12%, which is attractive for measuring small signals. We used THz imaging to explore wave behavior in metal-clad waveguide systems by employing indium tin oxide (ITO), which is a conductor …
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Primitive near-rings
The theory of near-rings has arisen in a variety of ways. There is a natural desire to generalise the theory of rings and skew fields by relaxing some of their defining axioms. It has also been the hope of some mathematicians that certain problems in group theory, particularly involving permutation …
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Ultra-wideband antenna design for microwave imaging applications. Design, optimisation and development of ultra-wideband antennas for microwave near-field sensing tools, and study the matching and radiation purity of these antennas within near field environment.
Near field imaging using microwave in medical applications has gain much attention recently as various researches show its high ability and accuracy in illuminating object comparing to the well-known screening tools such as Magnetic Resonance Imaging (MRI), digital mammography, ultrasound etc. This …