Deeply subwavelength phonon-polaritonic crystal made of a van der Waals material.

ABSTRACT: Photonic crystals (PCs) are periodically patterned dielectrics providing opportunities to shape and slow down the light for processing of optical signals, lasing and spontaneous emission control. Unit cells of conventional PCs are comparable to the wavelength of light and are not suitable for subwavelength scale applications. We engineer a nanoscale hole array in a van der Waals material (h-BN) supporting ultra-confined phonon polaritons (PhPs)-atomic lattice vibrations coupled to electromagnetic fields. Such a hole array represents a polaritonic crystal for mid-infrared frequencies having a unit cell volume of [Formula: see text] (with λ₀ being the free-space wavelength), where PhPs form ultra-confined Bloch modes with a remarkably flat dispersion band. The latter leads to both

SUBMITTER: Alfaro-Mozaz FJ 

PROVIDER: S-EPMC6318287 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature