Search for dissertations about: "near-field imaging"

Showing result 1 - 5 of 10 swedish dissertations containing the words near-field imaging.

  1. 1. Photonic terahertz-wave generation, radiation and quasioptical integration

    Author : Biddut Kumar Banik; [2007]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; semiconductor device modelling; semiconductor diodes; III-V semiconductors; Catadioptric lens; imaging; dipole antennas; slot antennas; lens antennas; semiconductor heterojunctions; dielectric loaded antennas; optical mixers; photomixers; near-field imaging; computer aided engineering; indium compounds; millimetre wave imaging; near-field optics; submillimeter wave generation; photodiodes; terahertz sources; millimetre wave generation; submillimetre wave integrated circuits; microwave imaging; uni-travelling-carrier photodiodes;

    Abstract : This thesis deals with the uni-travelling-carrier photodiode (UTC-PD) based photonic generation of terahertz waves, antenna designs for the terahertz radiation and a novelcatadioptric lens for quasioptical integration.The ongoing and accomplished research work on the UTC-PD, its limitations and optimisation scopes for attaining higher bandwidth and higher output power have been discussed. READ MORE

  2. 2. New laser-based techniques for nanometre lithography and microscopy

    Author : Lars Malmqvist; [1996]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Microscopy; near-field; frequency doubling; optical trapping; laser plasma; Atomic and molecular physics; low debris; Fysicumarkivet A:1996:Malmqvist; X-ray lithography; Atom- och molekylärfysik;

    Abstract : This thesis describes the development of new laser-based techniques for nanometre lithography and microscopy. The potential of a non-intrusive scanned near-field optical microscope (SNOM) has been investigated. The probe consists of an optically trapped microscopic particle which is scanned in proximity to the object to be studied. READ MORE

  3. 3. Optical Imaging and Spectroscopy of Metal Nanostructures

    Author : Juris Prikulis; [2003]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; nanoparticles; surface plasmon resonance; surface-enhanced Raman spectroscopy; near-field optical microscopy; optical tweezers;

    Abstract : Noble metal structures with size in the sub 100 nm range exhibit extraordinary optical properties due to collective oscillations of conduction electrons, the surface plasmon resonances (SPR). The most remarkable feature of these structures is the ability to redistribute electromagnetic radiation and concentrate strong fields near the surface. READ MORE

  4. 4. Controlled Source Radiomagnetotelluric (CSRMT) Applications in Environmental and Resource Exploration

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Nazli Ismail; Laust Pedersen; Bulent Tezkan; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Magnetotelluric; radio magnetotelluric; controlled-source tensor magnetotelluric; plane wave; near surface geophysics; sediment; fracture zone; inversion; forward modelling; near field effect; two-dimensional model; three-dimensional model; resolution; NATURAL SCIENCES Physics Other physics Geophysics; NATURVETENSKAP Fysik Övrig fysik Geofysik; Earth Sciences with Specialization Environmental Analysis; geovetenskap med inriktning mot miljöanalys; Hydrology; hydrologi; mineralogi; petrologi och tektonik; Mineral Chemistry; Petrology and Tectonics;

    Abstract : An integrated use of radio magnetotelluric (RMT) and controlled source tensor magnetotelluric (CSTMT) measurements, the so-called CSRMT method, has been employed in environmental and resource exploration studies. A number of case histories, including a groundwater investigation in glacial deposits, a study of fracture zones for geotechnical purposes and a mining exploration study of a copper deposit, are presented in this thesis in order to illustrate the usefulness and capability of the CSRMT method. READ MORE

  5. 5. Near-field scanning optical microscopy and fractal characterization with atomic force microscopy and other methods

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Anders Mannelquist; [2000]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fysik; Fysik;

    Abstract : This thesis is devoted to the development of near-field scanning optical microscopy (NSOM) for aqueous solutions and to fractal characterization of steel surfaces with atomic force microscopy (AFM) and other methods. NSOM combines optical properties from a light microscope and the technique of scanning probe microscopy, SPM (invented in the early 1980’s). READ MORE