Jump to main content
Jump to site search

Issue 44, 2017
Previous Article Next Article

Ultra-sensitive near-infrared graphene photodetectors with nanopillar antennas

Author affiliations

Abstract

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 detectors. The coupled antennas help to concentrate a 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 the metallic nanopillar, leading to wavelength-tunable photodetectors within a broad range from 0.6 μm to 1.2 μm. With the optimized design, the detector exhibits an excellent photoresponsivity of 7 A W−1 at a wavelength of 0.82 μm.

Graphical abstract: Ultra-sensitive near-infrared graphene photodetectors with nanopillar antennas

Back to tab navigation

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, 2017,9, 17459-17464
  •   Request permissions

    Ultra-sensitive near-infrared graphene photodetectors with nanopillar antennas

    Y. Liu, W. Huang, T. Gong, Y. Su, H. Zhang, Y. He, Z. Liu and B. Yu, Nanoscale, 2017, 9, 17459
    DOI: 10.1039/C7NR06009B

Search articles by author

Spotlight

Advertisements