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Inelastic electron tunneling and surface-enhanced optical spectroscopies atthe molecular scale require cryogenic local temperatures even underillumination - conditions that are challenging to achieve with plasmonicallyresonant metallic nanostructures. We report a detailed study of the laserheating of plasmonically active nanowires at substrate temperatures from 5 to60 K. The increase of the local temperature of the nanowire is quantified by abolometric approach and could be as large as 100 K for a substrate temperatureof 5 K and typical values of laser intensity. We also demonstrate that a $\sim3\times$ reduction of the local temperature increase is possible by switchingto a sapphire or quartz substrate. Finite element modeling of the heatdissipation reveals that the local temperature increase of the nanowire attemperatures below $\sim$50 K is determined largely by the thermal boundaryresistance of the metal-substrate interface. The model reproduces the strikingexperimental trend that in this regime the temperature of the nanowire variesnonlinearly with the incident optical power. The thermal boundary resistance isdemonstrated to be a major constraint on reaching low temperatures necessary toperform simultaneous inelastic electron tunneling and surface enhanced Ramanspectroscopies.

Plasmonic heating in Au nanowires at low Temperatures: The role of thermal boundary resistance