The high Q of microcavities, and the ultimate confinement of plasmonics may be advantageously combined in hybrid photonic-plasmonic resonators for ultrastrong light-matter interactions for SERS, polaritonic chemistry, and novel light sources. I will present the unique merits of hybrids on basis of plasmonic-nanoparticle-on-mirror systems in cavities as compared to simple metasurface etalons and constructs on basis of dielectric microdisk cavities and simple dipole antennas. I will discuss experimental evidence from linear mode spectroscopy, femtosecond SHG and two photon luminescence studies, and SERS, and will provide a viewpoint on potential uses for sideband-resolved molecular optomechanics.
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