Narrowband photodetection in the near-infrared with a plasmon-induced hot electron device

Ali Sobhani, Mark W. Knight, Yumin Wang, Bob Zheng, Nicholas S. King, Lisa V. Brown, Zheyu Fang, Peter Nordlander and Naomi J. Halas ()
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Ali Sobhani: Rice University
Mark W. Knight: Rice University
Yumin Wang: Rice University
Bob Zheng: Rice University
Nicholas S. King: Rice University
Lisa V. Brown: Laboratory for Nanophotonics, Rice University
Zheyu Fang: Rice University
Peter Nordlander: Rice University
Naomi J. Halas: Rice University

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: Abstract 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.

Date: 2013
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DOI: 10.1038/ncomms2642

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