Al nanogrid electrode for ultraviolet detectors
| Autor: | James C. Hwang, Winston V. Schoenfeld, Jie Deng, Liangcheng Zhou, Qiaoqiang Gan, Clarisse Mazuir, Volkmar Dierolf, Filbert J. Bartoli, G. Ding |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
business.industry Surface plasmon Photodetector medicine.disease_cause Atomic and Molecular Physics and Optics law.invention Optics Optical microscope law Electrode medicine Optoelectronics Near-field scanning optical microscope business Lithography Electron-beam lithography Ultraviolet |
| Zdroj: | Optics Letters. 36:3663 |
| ISSN: | 1539-4794 0146-9592 |
| DOI: | 10.1364/ol.36.003663 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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