Polaritons, originating from the interactions between photons and material excitations, have
attracted attention because of their strong field compression and deeply subdiffractional …

In this brief review, we summarize and elaborate on some of the nomenclature of polaritonic
phenomena and systems as they appear in the literature on quantum materials and …

Discoveries in quantum materials, which are characterized by the strongly quantum-
mechanical nature of electrons and atoms, have revealed exotic properties that arise from …

Phonon polaritons in van der Waals materials can strongly enhance light–matter interactions
at mid-infrared frequencies, owing to their extreme field confinement and long lifetimes …

Thin layers of in-plane anisotropic materials can support ultraconfined polaritons, whose
wavelengths depend on the propagation direction. Such polaritons hold potential for the …

Phonon polaritons enable light confinement at deep subwavelength scales, with potential
technological applications, such as subdiffraction imaging, sensing and engineering of …

Phonon polaritons provide useful opportunities, complementary to those provided by
plasmon polaritons, in the study of the interaction of light with matter at small scales. The …

Plasmon polaritons in topological insulators attract attention from a fundamental perspective
and for potential THz photonic applications. Although polaritons have been observed by THz …

Low-dimensional, strongly anisotropic nanomaterials can support hyperbolic phonon
polaritons, which feature strong light–matter interactions that can enhance their capabilities …

With intriguing properties that are different from the conventional bulk materials, two-
dimensional (2D) materials have attracted numerous and widespread research interests …