title: Narrowband photodetection in the near-infrared with a plasmon-induced hot electron device.
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.
authors.affiliation: Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA.
authors.forename: Ali
authors.initials: A
authors.lastname: Sobhani
authors.forename: Mark W
authors.initials: MW
authors.lastname: Knight
authors.forename: Yumin
authors.initials: Y
authors.lastname: Wang
authors.forename: Bob
authors.initials: B
authors.lastname: Zheng
authors.forename: Nicholas S
authors.initials: NS
authors.lastname: King
authors.forename: Lisa V
authors.initials: LV
authors.lastname: Brown
authors.forename: Zheyu
authors.initials: Z
authors.lastname: Fang
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander
authors.forename: Naomi J
authors.initials: NJ
authors.lastname: Halas
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