Influence of interface thermal resistance on relaxation dynamics of metal-dielectric nanocomposite materials under ultrafast pulse laser excitation

Nanocomposite materials, including noble metal nanoparticles embedded in a dielectric host medium, areinteresting because of their optical properties linked to surface plasmon resonance phenomena. for studding ofnonlinear optical properties and/or energy transfer process, these materials may be excited by ultrashort pulselaser with a temporal width varying from some femtoseconds to some hundreds of picoseconds. following ofabsorption of light energy by metal-dielectric nanocomposite material, metal nanoparticles are heated. then, thethermal energy is transferred to the host medium through particle-dielectric interface. on the one hand,nonlinear optical properties of such materials depend on their thermal responses to laser pulse, and on the otherhand different parameters, such as pulse laser and medium thermodynamic characterizes, govern on the thermalresponses of medium to laser pulse. here, influence of thermal resistance at particle-surrounding mediuminterface on thermal response of such material under ultrashort pulse laser excitation is investigated. for this,we used three temperature model based on energy exchange between different bodies of medium. the resultsshow that the interface thermal resistance plays a crucial role on nanoparticle cooling dynamics, so that therelaxation characterized time increases by increasing of interface thermal resistance