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Coherent interconversion of signals between optical and mechanical domains isenabled by optomechanical interactions. Extreme light-matter coupling producedby confining light to nanoscale mode volumes can then access singlemid-infrared (MIR) photon sensitivity. Here we utilise the infrared absorptionand Raman activity of molecular vibrations in plasmonic nanocavities todemonstrate frequency upconversion. We convert {\lambda}~10 {\mu}m incominglight to visible via surface-enhanced Raman scattering (SERS) indoubly-resonant antennas that enhance upconversion by >10^10. We show >200%amplification of the SERS antiStokes emission when a MIR pump is tuned to amolecular vibrational frequency, obtaining lowest detectable powers ~1{\mu}W/{\mu}m^2 at room temperature. These results have potential for low-costand large-scale infrared detectors and spectroscopic techniques, and bringsingle-molecule sensing into the infrared

Detecting mid-infrared light by molecular frequency upconversion with dual-wavelength hybrid nanoantennas