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 15 of 15 for “"Near field imaging"”.
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Near-field imaging with terahertz pulses
High spatial resolution imaging 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 …
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Development of a multipurpose near-field imaging platform
… probe microscopy (SPM) with traditional optical imaging 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 …
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Development of Active Terahertz Modulators for use with Quantum Cascade Lasers and Near-Field Imaging of their Individual Resonators
… were designed to change the polarisation of a linear THz beam, changing either the angle of rotation of the linear polarisation or converting from linear to elliptical polarisation, depending on the frequency. These devices were then coupled with THz QCLs to manipulate the linear polarisation …
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Radio wave imaging using Ultra-Wide Band Spectrum Antennas for Near-Field Applications. Design, Development, and Measurements of Ultra-Wideband Antenna for Microwave Near-Field Imaging Applications by applying Optimisation Algorithms
… has yielded tremendous and vital impacts in the field of microwave wireless communications. These applications include military radar imaging, security screening, and tumour detection, especially for early detection of breast cancer. These indicators have stimulated and inspired many researchers …
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Novel modulated antennas and probes for millimeter wave imaging applications
… and millimeter wave (300 MHz - 300 GHz) imaging techniques have shown great potential for a wide range of industrial and medical applications. These techniques are fundamentally based on measuring relative and coherent electromagnetic fields distributions, e.g., electric fields, around …
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Phase-Coherent Drag of Plasmons in a 2D Flowing Fermi Liquid
… the motional Fermi-liquid effects in plasmonic near-field imaging experiments.
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Tunable emission from two-dimensional semiconductor with platelet optical antennas
… and the plasmonic modes are obtained both by near-field imaging and numerical simulation. The tunability of photoluminescence by nearby antenna is analyzed in details. This thesis proposes an economic and promising way to tune the emission of low-quantum-yield emitters, such as MoS2 , while …
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Fabrication of Fluorescent Nanoprobes and Their Applications in Nanophotonics
… range of applications, including nanostructure imaging, single molecular detection, and physical, chemical, and biological sensing applications. However, since the scale of nanodevices is substantially less than the optical diffraction limit, their fabrication remains a difficult challenge. …
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Novel Devices for Terahertz Wave Imaging, Wave-guiding and Sensing
… to manipulate terahertz waves for broadband near-field imaging, wave-guiding (invisible space), and sensing (resonator), are presented in this thesis. We developed the original working concepts of each device, and demonstrated the prototype experimentally in our lab. The working concepts of …
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Dynamic polarizability and collective modes in narrow-band electron systems
… plasmons that are readily accessible in near-field imaging experiments. We further show that the over-the-band plasmon dispersion remains robust in the presence of ordering of the narrow-band carriers. The specific examples of a Wigner crystal and a Mott-Hubbard order, worked out in …
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Ultra-Wideband Imaging System For Medical Applications. Simulation models and Experimental Investigations for Early Breast Cancer & Bone Fracture Detection Using UWB Microwave Sensors
Near field imaging using microwaves in medical applications is of great current interest for its capability and accuracy in identifying features of interest, in comparison with other known screening tools. Many imaging methods have been developed over the past two decades showing the potential of …
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Optoelectronics of graphene-based Van der Waals heterostructures
… (homo- or hetero-) is a rapidly emerging field in condensed matter physics. They are layered structures with strong chemical bonding within layers and relatively weak van der Waals force to combine layers together. This unique layer-bylayer nature makes it easy to exfoliate layers out and …
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Design and experimental observation of topological states in photonic metasurfaces
… controlling optical coupling and electromagnetic field distributions in nanostructures. Diverse phenomena supported by photonic topological structures include robust scatter-free waveguiding, an extreme confinement of light, lasing and strong coupling with novel low- dimensional materials. A very …
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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 …