An electrical analogy to Mie scattering

José M. Caridad, Stephen Connaughton, Christian Ott, Heiko B. Weber and Vojislav Krstić ()
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José M. Caridad: School of Physics, Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), AMBER at CRANN, Trinity College Dublin, College Green
Stephen Connaughton: School of Physics, Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), AMBER at CRANN, Trinity College Dublin, College Green
Christian Ott: Chair for Applied Physics, Friedrich-Alexander-University Erlangen-Nürnberg (FAU)
Heiko B. Weber: Chair for Applied Physics, Friedrich-Alexander-University Erlangen-Nürnberg (FAU)
Vojislav Krstić: School of Physics, Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), AMBER at CRANN, Trinity College Dublin, College Green

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Mie scattering is an optical phenomenon that appears when electromagnetic waves, in particular light, are elastically scattered at a spherical or cylindrical object. A transfer of this phenomenon onto electron states in ballistic graphene has been proposed theoretically, assuming a well-defined incident wave scattered by a perfectly cylindrical nanometer scaled potential, but experimental fingerprints are lacking. We present an experimental demonstration of an electrical analogue to Mie scattering by using graphene as a conductor, and circular potentials arranged in a square two-dimensional array. The tabletop experiment is carried out under seemingly unfavourable conditions of diffusive transport at room-temperature. Nonetheless, when a canted arrangement of the array with respect to the incident current is chosen, cascaded Mie scattering results robustly in a transverse voltage. Its response on electrostatic gating and variation of potentials convincingly underscores Mie scattering as underlying mechanism. The findings presented here encourage the design of functional electronic metamaterials.

Date: 2016
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DOI: 10.1038/ncomms12894

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