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Opt Express. 2010 Apr 12;18(8):8505-14. doi: 10.1364/OE.18.008505.

Surface plasmon waveguide Schottky detector.

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  • 1School of Information Technology and Engineering, University of Ottawa, 161 Louis Pasteur St., Ottawa, K1N 6N5, Canada.


A surface plasmon polariton detector is demonstrated at infra-red wavelengths. The device consists of a metal stripe on silicon forming a Schottky contact thereon and supporting surface a plasmon polariton mode that is strongly confined and localised to the metal-semiconductor interface. Detection of optical radiation below the bandgap of silicon (at infrared wavelengths) occurs through internal photoemission. Responsivities of 0.38 and 1.04 mA/W were measured via end-fire coupling to a tapered optical fibre, at room temperature and at a wavelength of 1280 nm, for gold and aluminium stripes on n-type silicon, respectively. The device can be integrated with other structures used in nano-plasmonics, nano-photonics or silicon-based photonics, and it holds promise for short-reach optical interconnects and power monitoring applications.

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