Hexagonal boron nitride has been proposed as an excellent candidate to achieve subwavelength infrared light manipulation, enabling excitation of low-loss phonon polaritons with hyperbolic dispersion. The publication of Tamagone et al. from the Harvard University show that subwavelength hexagonal boron nitride nanostructures can exhibit ultra-confined resonances and local field enhancement. They have investigated strong light-matter interaction in these nanoscale structures via photo-induced force microscopy (PiFM). PiFM captures ultra-confined resonances and local field enhancement in hexagonal boron nitride optical nano-dipole antennae.
