Collective near-field coupling and nonlocal phenomena in infrared-phononic metasurfaces for nano-light canalization

Peining Li, Guangwei Hu, Irene Dolado, Mykhailo Tymchenko, Cheng-Wei Qiu, Francisco Javier Alfaro-Mozaz, Fèlix Casanova, Luis E. Hueso, Song Liu, James H. Edgar, Saül Vélez, Andrea Alu and Rainer Hillenbrand ()
Additional contact information
Peining Li: Huazhong University of Science and Technology
Guangwei Hu: National University of Singapore
Irene Dolado: CIC nanoGUNE BRTA
Mykhailo Tymchenko: City University of New York
Cheng-Wei Qiu: National University of Singapore
Francisco Javier Alfaro-Mozaz: CIC nanoGUNE BRTA
Fèlix Casanova: CIC nanoGUNE BRTA
Luis E. Hueso: CIC nanoGUNE BRTA
Song Liu: Kansas State University
James H. Edgar: Kansas State University
Saül Vélez: ETH Zürich
Andrea Alu: City University of New York
Rainer Hillenbrand: IKERBASQUE, Basque Foundation for Science

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Polaritons – coupled excitations of photons and dipolar matter excitations – can propagate along anisotropic metasurfaces with either hyperbolic or elliptical dispersion. At the transition from hyperbolic to elliptical dispersion (corresponding to a topological transition), various intriguing phenomena are found, such as an enhancement of the photonic density of states, polariton canalization and hyperlensing. Here, we investigate theoretically and experimentally the topological transition, the polaritonic coupling and the strong nonlocal response in a uniaxial infrared-phononic metasurface, a grating of hexagonal boron nitride (hBN) nanoribbons. By hyperspectral infrared nanoimaging, we observe a synthetic transverse optical phonon resonance (strong collective near-field coupling of the nanoribbons) in the middle of the hBN Reststrahlen band, yielding a topological transition from hyperbolic to elliptical dispersion. We further visualize and characterize the spatial evolution of a deeply subwavelength canalization mode near the transition frequency, which is a collimated polariton that is the basis for hyperlensing and diffraction-less propagation.

Date: 2020
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DOI: 10.1038/s41467-020-17425-9

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