Title

Al Nanogrid Electrode For Ultraviolet Detectors

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 365nm. 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. © 2011 Optical Society of America.

Publication Date

9-15-2011

Publication Title

Optics Letters

Volume

36

Issue

18

Number of Pages

3663-3665

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OL.36.003663

Socpus ID

80052932949 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/80052932949

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