Metamaterials with index ellipsoids at arbitrary k-points

Wen-Jie Chen, Bo Hou, Zhao-Qing Zhang, John B. Pendry and C. T. Chan ()
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Wen-Jie Chen: The Hong Kong University of Science and Technology
Bo Hou: The Hong Kong University of Science and Technology
Zhao-Qing Zhang: The Hong Kong University of Science and Technology
John B. Pendry: Imperial College
C. T. Chan: The Hong Kong University of Science and Technology

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract Propagation behaviors of electromagnetic waves are governed by the equifrequency surface of the medium. Up to now, ordinary materials, including the medium exist in nature and the man-made metamaterials, always have an equifrequency surface (ellipsoid or hyperboloid) centered at zero k-point. Here we propose a new type of metamaterial possessing multiple index ellipsoids centered at arbitrary nonzero k-points. Their locations in momentum space are determined by the connectivity of a set of interpenetrating metallic scaffolds, whereas the group velocities of the modes are determined by the geometrical details. Such system is a new class of metamaterial whose properties arise from global connectivity and hence can have broadband functionality in applications such as negative refraction, orientation-dependent coupling effect, and cavity without walls, and they are fundamentally different from ordinary resonant metamaterials that are inherently bandwidth limited. We perform microwave experiments to confirm our findings.

Date: 2018
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DOI: 10.1038/s41467-018-04490-4

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