Ultra-confined mid-infrared resonant phonon polaritons in van der Waals nanostructures.

ABSTRACT: Hexagonal boron nitride has been proposed as an excellent candidate to achieve subwavelength infrared light manipulation owing to its polar lattice structure, enabling excitation of low-loss phonon polaritons with hyperbolic dispersion. We show that strongly subwavelength hexagonal boron nitride planar nanostructures can exhibit ultra-confined resonances and local field enhancement. We investigate strong light-matter interaction in these nanoscale structures via photo-induced force microscopy, scattering-type scanning near-field optical microscopy, and Fourier transform infrared spectroscopy, with excellent agreement with numerical simulations. We design optical nano-dipole antennas and directly image the fields when bright- or dark-mode resonances are excited. These modes are deep subwave

SUBMITTER: Tamagnone M 

PROVIDER: S-EPMC6003750 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature