Type-I hyperbolic metasurfaces for highly-squeezed designer polaritons with negative group velocity

Yihao Yang, Pengfei Qin, Xiao Lin, Erping Li, Zuojia Wang (), Baile Zhang () and Hongsheng Chen ()
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Yihao Yang: Zhejiang University
Pengfei Qin: Zhejiang University
Xiao Lin: Nanyang Technological University
Erping Li: Zhejiang University
Zuojia Wang: Shandong University
Baile Zhang: Nanyang Technological University
Hongsheng Chen: Zhejiang University

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Hyperbolic polaritons in van der Waals materials and metamaterial heterostructures provide unprecedented control over light-matter interaction at extreme nanoscales. Here we propose a concept of type-I hyperbolic metasurface supporting highly-squeezed magnetic designer polaritons, which act as magnetic analogs of hyperbolic polaritons in the hexagonal boron nitride (h-BN) in the first Reststrahlen band. Compared with the natural h-BN, the size and spacing of the metasurface unit cell can be readily engineered, allowing for manipulating designer polaritons in frequency and space with greater flexibility. Microwave experimental measurements display a cone-like dispersion in momentum space, exhibiting an effective refractive index up to 60 and a group velocity down to c/400. Tailoring the metasurface, we demonstrate an ultra-compact integrated designer polariton circuit including high-transmission 90° sharp bending waveguides and waveguide splitters. The present metasurface could serve as a platform for polaritonics, and find applications in waveguiding, terahertz sensing, subdiffraction focusing/imaging, low-threshold terahertz Cherenkov radiation, and wireless energy transfer.

Date: 2019
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DOI: 10.1038/s41467-019-10027-0

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