期刊
SCIENTIFIC REPORTS
卷 6, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/srep37564
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资金
- State Scholarship Fund of the China Scholarship Council
- Aurel-Stodola-Fonds [ETH-25 11-2]
- Alstom [SP-ESC-A 02-14]
- Swiss National Science Foundation [P2EZP2_159101]
- Swiss National Science Foundation (SNF) [P2EZP2_159101] Funding Source: Swiss National Science Foundation (SNF)
Light detection and quantification is fundamental to the functioning of a broad palette of technologies. While expensive avalanche photodiodes and superconducting bolometers are examples of detectors achieving single-photon sensitivity and time resolutions down to the picosecond range, thermoelectric-based photodetectors are much more affordable alternatives that can be used to measure substantially higher levels of light power (few kW/cm(2)). However, in thermoelectric detectors, achieving broadband or wavelength-selective performance with high sensitivity and good temporal resolution requires careful design of the absorbing element. Here, combining the high absorptivity and low heat capacity of a nanoengineered plasmonic thin-film absorber with the robustness and linear response of a thermoelectric sensor, we present a hybrid detector for visible and near-infrared light achieving response times of the order of 100 milliseconds, almost four times shorter than the same thermoelectric device covered with a conventional absorber. Furthermore, we show an almost two times higher light-to-electricity efficiency upon replacing the conventional absorber with a plasmonic absorber. With these improvements, which are direct results of the efficiency and ultra-small thickness of the plasmonic absorber, this hybrid detector constitutes an ideal component for various medium-intensity light sensing applications requiring spectrally tailored absorption coatings with either broadband or narrowband characteristics.
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