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Ultra-sensitive near-infrared graphene photodetector with nanopillar antennas


Graphene has been demonstrated as a candidate for optoelectronic devices due to its broad absorption spectrum and ultra-high carrier mobility. However, graphene is essentially transparent in visible and near-infrared regimes with an absorptivity of 2.3%, which largely limits its application in photodetection. Here, we show that metallic nanopillar antennas could improve light absorption in graphene detector. The coupled antennas help to concentrate free space electromagnetic wave around the nanopillars by localized surface plasmon resonance, strongly impacted by geometrical design. It is found that spectral selectivity can be realized by tuning key geometrical parameters such as period, radius, and height of metallic nanopillar, leading to wavelength-tunable photodetectors within a broad range from 0.6 μm to 1.2 μm. With optimized design, the detector exhibits excellent photoresponsivity of 7 A/W at the wavelength of 0.82 μm.

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Publication details

The article was received on 14 Aug 2017, accepted on 11 Oct 2017 and first published on 11 Oct 2017

Article type: Paper
DOI: 10.1039/C7NR06009B
Citation: Nanoscale, 2017, Accepted Manuscript
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    Ultra-sensitive near-infrared graphene photodetector with nanopillar antennas

    Y. Liu, W. Huang, T. Gong, Y. Su, H. Zhang, Y. He, Z. Liu and B. Yu, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06009B

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