Ultrastrong coupling between light and matter has, in the past decade, transitioned from a
theoretical idea to an experimental reality. It is a new regime of quantum light–matter …

Recent experiments have demonstrated that light and matter can mix together to an extreme
degree, and previously uncharted regimes of light-matter interactions are currently being …

Surface plasmon polaritons (SPPs) are spatially confined electromagnetic field modes at a
metal-dielectric interface capable of generating intense near-field optical forces on ultrafast …

Hybrid excitations, called polaritons, emerge in systems with strong light–matter coupling.
Usually, they dominate the linear and nonlinear optical properties with applications in …

Vibrational ultrastrong coupling, where the light–matter coupling strength is comparable to
the vibrational frequency of molecules, presents new opportunities to probe the interactions …

Exciton-polaritons are bosonic quasiparticles that arise from the normal mode splitting of
photons in a microcavity and excitons in a semiconductor material. One of the most …

The interaction of light and matter at the single-photon level is of central importance in
various fields of physics, including, eg, condensed matter physics, astronomy, quantum …

Electrically tunable mid‐infrared metasurfaces with nanosecond response time and broad
tuning range are reported. Electrical tuning is achieved by employing strong polaritonic …

We provide a theoretical description of the coupling between the electromagnetic field and
the intersubband excitations of a bidimensional electron gas. Our theory, based on the …

The interaction between cavity modes and optical transitions leads to new coupled light-
matter states in which the energy is periodically exchanged between the matter states and …