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Journal Article
An electrical analogy to Mie scattering
2016
Overview
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.
Until now experimental evidence of an electrical analogy to Mie scattering is lacking. Here, Caridad and Krstić
et al
. present an experimental demonstration of an electrical analogue to Mie scattering by using graphene as conductor, and circular potentials arranged in a canted two-dimensional array.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
