Al nanogrid electrode for ultraviolet detectors

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

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)3663-3665
Number of pages3
JournalOptics Letters
Volume36
Issue number18
DOIs
StatePublished - Sep 15 2011
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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