  A remote energy transfer pathway from electronic to vibrational degrees of
freedom is identified inside an infrared optical cavity under vibrational
strong coupling conditions. This mechanism relies on the dynamical Casimir
effect, whereby real infrared photons are generated due to a sudden electronic
transition of anisotropic molecules. Moreover, the formation of vibrational
polaritons enables the excited photon energy to be transferred to the
vibrational degrees of freedom before any dissipation occurs. Both analytic
solutions and numerical simulations reveal that the magnitude of this
electronic to vibrational energy transfer depends quadratically on the number
of molecules and resonantly on the vibration-cavity detuning. During this
"supervibronic" transition process, because the vibrational energy gain per
molecule can be meaningful in the macroscopic limit, this process may
potentially be observed using conventional vibrational strong coupling devices.
