Plasmonic nanostructure enhanced graphene-based photodetectors

T. J. Echtermeyer, L. Britnell, S. Milana, A. Lombardo, R. V. Gorbachev, A. N. Grigorenko, A. K. Geim, K. S. Novoselov, A. C. Ferrari


Graphene exhibits electrical and optical properties promising for future applications in ultra-fast photonics [1]. High carrier mobility and Fermi velocity [2, 3] combined with its constant absorption over the visible wavelength range to the near-infrared [4] potentially allow its application for photodetection over a broad wavelength spectrum, operating at high frequencies. However, absorption being 2.3% per monolayer [4], responsivity of these devices is rather low [5, 6]. Here we show that by combining graphene-based photodetectors with metal-nanostructures, plasmonic effects lead to an increased responsivity.

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