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The plasmon resonance of a structure is primarily dictated by its opticalproperties and geometry, which can be modified to enable hot-carrierphotodetectors with superior performance. Recently, metal-alloys have played aprominent role in tuning the resonance of plasmonic structures through chemicalcomposition engineering. However, it has been unclear how alloying modifies thetime dynamics of generated hot-carriers. In this work, we elucidate the role ofchemical composition on the relaxation time of hot-carriers for the archetypalAux Ag1-x thin-film system. Through time-resolved optical spectroscopymeasurements in the visible wavelength range, we measure composition-dependentrelaxation times that vary up to 8x for constant pump fluency. Surprisingly, wefind that the addition of 2% of Ag into Au films can increase the hot carrierlifetime by approximately 35% under fixed fluence, as a result of a decrease inoptical loss. Further, the relaxation time is found to be inverselyproportional to the imaginary part of the permittivity. Our results indicatethat alloying is a promising approach to effectively control hot-carrierrelaxation time in metals.

Control of hot-carrier relaxation time in Au-Ag thin films through alloying