The interaction between molecular electronic transitions and electromagnetic fields can be
enlarged to the point where distinct hybrid light–matter states, polaritons, emerge. The …

Conspectus Molecular vibrations constitute one of the smallest mechanical oscillators
available for micro-/nanoengineering. The energy and strength of molecular oscillations …

Coherent upconversion of terahertz and mid-infrared signals into visible light opens new
horizons for spectroscopy, imaging, and sensing but represents a challenge for conventional …

Coherent interconversion of signals between optical and mechanical domains is enabled by
optomechanical interactions. Extreme light-matter coupling produced by confining light to …

Quantum sensors such as spin defects in diamond have achieved excellent performance by
combining high sensitivity with spatial resolution. Unfortunately, these sensors can only …

Plasmon resonances at the surface of metallic antennas allow for extreme enhancement of
Raman scattering. Intrinsic to plasmonics, however, is that extreme field confinement lacks …

Photon avalanche (PA)—where the absorption of a single photon initiates a 'chain
reaction'of additional absorption and energy transfer events within a material—is a highly …

Recent developments in surface-enhanced Raman scattering (SERS) enable observation of
single-bond vibrations in real time at room temperature. By contrast, mid-infrared (MIR) …

While infrared spectroscopy is a powerful technique that provides molecular information
such as chemical constituents and chemical structures of analytes, it suffers from low …

Plasmonic self-assembled nanocavities are ideal platforms for extreme light localization as
they deliver mode volumes of< 50 nm3. Here we show that high-order plasmonic modes …