Abstract
The demand to measure and understand thermal transport at the nanoscale is increasing recently with needs to control heat conduction by nanostructures. In this study, we have attempted to probe quasi-ballistic thermal transport by time-domain thermoreflectance measurements taking advantage of the plasmon resonance of gold nanoislands. The gold nanoislands are casted onto a sample surface by vacuum evaporation method, and then annealed at 500℃, 700℃, and 900℃ in order to change the contact area between the gold nanoislands and substrate. The contact area was found to shrink by raising the annealing temperature from 700℃ to 900℃. The size-dependent thermal conductivity of GNI/fused quartz and GNI/Sapphire agrees with a solution of the Boltzmann transport equation.
