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Modelling and fabrication of near-field optical systems

Posted on:2005-08-25Degree:M.ScType:Thesis
University:University of Alberta (Canada)Candidate:Dechant, AnthonyFull Text:PDF
GTID:2458390008487735Subject:Engineering
Abstract/Summary:
This thesis presents the design and fabrication of a combined atomic force microscope/near-field optical microscope probe based on a double-sided micromachining technique allowing for high-yield batch fabrication. The probes consist of a hollow pyramidal metal tip, nanometer diameter aperture, silicon cantilever and holder. By circumventing the need for anodic bonding between the cantilever and holder, stresses in the probes are minimized. A finite-difference time-domain software suite is also developed. Using this software suite, two apertured near-field optical probe designs, a micro-layer probe, featuring a high index gallium phosphide evaporated layer, and a microsphere probe incorporating a silica microsphere lens, demonstrate an intensity throughput several orders of magnitude greater than conventional fiber-based probes. This software suite is also utilized to model ultrashort pulse propagation through metallic nano-arrays. The role of impulsively excited surface plasmons (SP) is investigated as a mechanism for the observed enhanced transmission, re-radiation and superluminal velocity.
Keywords/Search Tags:Fabrication, Optical, Probe
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