Hyperbolic phonon polaritons

Byung-II NohAuburn University, Auburn, Alabama, USA _______________________________________ Electromagnetic hyperbolicity, with access to sub-diffraction optics and high photonic density of states, has driven key functionalities in nanophotonics, including super-resolution imaging, efficient energy control, and extreme light manipulation. Central to these advances are hyperbolic polaritons—nanometer-scale light-matter waves—spanning multiple energy-momentum dispersion orders with increasing optical momenta. While high-order…