UMD Theses and Dissertations

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New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a given thesis/dissertation in DRUM.

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Author: search.filters.author.Adiga, Vivekananda ParampalliSubject: search.filters.subject.Physics, Condensed Matter

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    Developement of High Throughput Polarization Maintaining NSOM Probes
    (2005-05-02) Adiga, Vivekananda Parampalli; Phaneuf, Raymond J; Drew, Howard D; Material Science and Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    High throughput, polarization maintaining probes for Near-field Scanning Optical Microscopy (NSOM) were fabricated by chemical etching. An aperture was formed with Focused Ion Beam after coating the tips with 300 nm of aluminum. Tips showed a typical far field polarization extinction ratio of 100 to 1. The throughput of the tips depends on the polarization of the incident light because of the boundary conditions imposed by elliptical aperture. We show NSOM images obtained with these probes on gold dots on a GaAs substrate. NSOM images show a contrast inversion on the gold dots compared to the far-field imaging. We were not able to determine the spatial resolution of the probes since the topographic effects dominate the optical response. Interference effects and variation of the light intensity in close proximity to the sample are observed and studied.