Title

Al nanogrid electrode for ultraviolet detectors

Authors

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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