Ultra-compact silicon waveguide-integrated Schottky photodetectors using perfect absorption from tapered metal nanobrick arrays

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We propose and numerically analyze an integrated metal-semiconductor Schottky photodetector consisting of a tapered metal nanoblock chain on a silicon ridge waveguide. The metal-semiconductor junctions allow broadband sub-bandgap photodetection through the internal photoemission effects. The tapered array structures with different block widths can gradually tailor the cut-off frequencies and group velocities of the tightly confined plasmonic modes for enhanced light absorption and suppressed reflection of the photonic mode in the silicon waveguide. As a result, according to our simulations, six metal nanobricks with a total device length of 830 nm can almost perfectly absorb the incident sub-bandgap light and subsequently generate photocurrents with a peak responsivity value of 0.125 A/W at 1550 mn We believe that the proposed design can provide a simple and viable solution for broadband and compact photodetection in the integrated silicon photonics platform. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Publisher
OPTICAL SOC AMER
Issue Date
2019-06
Language
English
Article Type
Article
Citation

OPTICS EXPRESS, v.27, no.12, pp.16413 - 16424

ISSN
1094-4087
DOI
10.1364/OE.27.016413
URI
http://hdl.handle.net/10203/262911
Appears in Collection
EE-Journal Papers(저널논문)
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