Infrared hyperbolic metasurface based on nanostructured van der Waals materials
Abstract
Metasurfaces with strongly anisotropic optical properties can support deep subwavelength-scale confined electromagnetic waves (polaritons) that promise opportunities for controlling light in photonic and optoelectronic applications. We develop a mid-infrared hyperbolic metasurface by nanostructuring a thin layer of hexagonal boron nitride supporting deep subwavelength-scale phonon polaritons that propagate with in-plane hyperbolic dispersion. By applying an infrared nanoimaging technique, we visualize the concave (anomalous) wavefronts of a diverging polariton beam, which represent a landmark feature of hyperbolic polaritons. The results illustrate how near-field microscopy can be applied to reveal the exotic wavefronts of polaritons in anisotropic materials, and demonstrate that nanostructured van der Waals materials can form a highly variable and compact platform for hyperbolic infrared metasurface devices and circuits.
Cite
@article{arxiv.1904.03945,
title = {Infrared hyperbolic metasurface based on nanostructured van der Waals materials},
author = {Peining Li and Irene Dolado and Francisco Javier Alfaro-Mozaz and Felix Casanova and Luis E. Hueso and Song Liu and James H. Edgar and Alexey Y. Nikitin and Saül Vélez and Rainer Hillenbrand},
journal= {arXiv preprint arXiv:1904.03945},
year = {2019}
}