Al nanogrid electrode for ultraviolet detectors

    Authors

    G. Ding; J. Deng; L. Zhou; Q. Gan; J. C. M. Hwang; V. Dierolf; F. J. Bartoli; C. Mazuir;W. V. Schoenfeld

    Comments

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    Abbreviated Journal Title

    Opt. Lett.

    Keywords

    EXTRAORDINARY OPTICAL-TRANSMISSION; SURFACE-PLASMONS; Optics

    Abstract

    Optical properties of Al nanogrids of different pitches and gaps were investigated both theoretically and experimentally. Three-dimensional finite-difference time-domain simulation predicted that surface plasmons at the air/Al interface would enhance ultraviolet transmission through the subwavelength gaps of the nanogrid, making it an effective electrode on GaN-based photodetectors to compensate for the lack of transparent electrode and high p-type doping. The predicted transmission enhancement was verified by confocal scanning optical microscopy performed at 365 nm. The quality of the nanogrids fabricated by electron-beam lithography was verified by near-field scanning optical microscopy and scanning electron microscopy. Based on the results, the pitch and gap of the nanogrids can be optimized for the best trade-off between electrical conductivity and optical transmission at different wavelengths. Based on different cutoff wavelengths, the nanogrids can also double as a filter to render photodetectors solar-blind. (C) 2011 Optical Society of America

    Journal Title

    Optics Letters

    Volume

    36

    Issue/Number

    18

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    3663

    Last Page

    3665

    WOS Identifier

    WOS:000294951100045

    ISSN

    0146-9592

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