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.

References in corpus (2)

• Sub-diffractional, volume-confined polaritons in a natural hyperbolic material: hexagonal boron nitride
• Subdiffractional focusing and guiding of polaritonic rays in a natural hyperbolic material

Cited by in corpus (7)

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• Van der Waals thin films of WTe2 for natural hyperbolic plasmonic surfaces
• The Optical Properties and Plasmonics of Anisotropic 2-Dimensional Materials
• Phonon polaritonics in two-dimensional materials
• Low-temperature infrared dielectric function of hyperbolic $\alpha$-quartz
• Electromagnetic surface waves guided by the planar interface of isotropic chiral materials
• Guided Mid-IR and Near-IR Light within a Hybrid Hyperbolic-Material/Silicon Waveguide Heterostructure