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Photo-excitation at terahertz and mid-infrared frequencies has emerged as anew way to manipulate functionalities in quantum materials, in some casescreating non-equilibrium phases that have no equilibrium analogue. InK$_3$C$_{60}$, a metastable zero-resistance phase was documented with opticalproperties and pressure dependences compatible with non-equilibrium hightemperature superconductivity. Here, we report the discovery of a dominantenergy scale for this phenomenon, along with the demonstration of a giantincrease in photo-susceptibility near 10 THz excitation frequency. At thesedrive frequencies a metastable superconducting-like phase is observed up toroom temperature for fluences as low as ~400 $\mu J/cm^2$. These findings shedlight on the microscopic mechanism underlying photo-induced superconductivity.They also trace a path towards steady state operation, currently limited by theavailability of a suitable high-repetition rate optical source at thesefrequencies.

Giant resonant enhancement for photo-induced superconductivity in K$_3$C$_{60}$