Al nanogrid electrode for ultraviolet detectors |
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Authors: | Ding G Deng J Zhou L Gan Q Hwang J C M Dierolf V Bartoli F J Mazuir C Schoenfeld W V |
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Institution: | Center for Optical Technologies, Lehigh University, Bethlehem, Pennsylvania 18015, USA. gud208@lehigh.edu |
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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. |
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