期刊
NATURE COMMUNICATIONS
卷 4, 期 -, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/ncomms2642
关键词
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资金
- National Security Science and Engineering Faculty Fellowship programme of the US Department of Defense [N00244-09-1-0067]
- Robert A. Welch Foundation [C-1220, C-1222]
- Office of Naval Research [N00014-10-1-0989]
- NSF MRI grant [ECCS-1040478]
In gratings, incident light can couple strongly to plasmons propagating through periodically spaced slits in a metal film, resulting in a strong, resonant absorption whose frequency is determined by the nanostructure periodicity. When a grating is patterned on a silicon substrate, the absorption response can be combined with plasmon-induced hot electron photocurrent generation. This yields a photodetector with a strongly resonant, narrowband photocurrent response in the infrared, limited at low frequencies by the Schottky barrier, not the bandgap of silicon. Here we report a grating-based hot electron device with significantly larger photocurrent responsivity than previously reported antenna-based geometries. The grating geometry also enables more than three times narrower spectral response than observed for nanoantenna-based devices. This approach opens up the possibility of plasmonic sensors with direct electrical readout, such as an on-chip surface plasmon resonance detector driven at a single wavelength.
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