期刊
NANO LETTERS
卷 17, 期 2, 页码 985-991出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b04332
关键词
Silicon photonics; plasmonics; black phosphorus; photodetector; nanogap; extraordinary optical transmission
类别
资金
- Air Force Office of Scientific Research [FA9550-14-1-0277]
- National Science Foundation [ECCS-1351002, ECCS-1610333]
- NIH Biotechnology Training Grant [T32 GM008347]
- NSF through the National Nanotechnology Coordinated Infrastructure (NNCI) program
- NSF
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1351002, 1610333] Funding Source: National Science Foundation
We demonstrate the integration of a black phosphorus photodetector in a hybrid, three-dimensional architecture of silicon photonics and metallic nanoplasmonics structures. This integration approach combines the advantages of the low propagation loss of silicon waveguides, high-field confinement of a plasmonic nanogap, and the narrow bandgap of black phosphorus to achieve high responsivity for detection of telecom-band, near-infrared light. Benefiting from an ultrashort channel (similar to 60 nm) and near-field enhancement enabled by the nanogap structure, the photodetector shows an intrinsic responsivity as high as 10 A/W afforded by internal gain mechanisms, and a 3 dB roll-off frequency of 150 MHz. This device demonstrates a promising approach for on-chip integration of three distinctive photonic systems, which, as a generic platform, may lead to future nanophotonic applications for biosensing, nonlinear optics, and optical signal processing.
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