Phys.org  August 26, 2024 Anisotropic planar polaritons – hybrid electromagnetic modes mediated by phonons, plasmons, or excitons – in biaxial two-dimensional (2D) van der Waals crystals have attracted significant attention due to their fundamental physics and potential nanophotonic applications. An international team of researchers (USA – University of Minnesota, Auburn University, Purdue University, City University of New York, IBM T. J. Watson Research Center, Vanderbilt University, Republic of Korea, Spain) reviewed the properties of planar hyperbolic polaritons and methods that could be used to experimentally tune them. They argued that such natural, planar hyperbolic media should be common in biaxial […]