Evaluation of Transient Thermoreflectance of Porous Silicon Membranes for Thermal Interface Applications

Abstract

This work involves investigation and separation of the plasmonic and thermal carrier dynamics of porous silicon membrane. The time resolved reflectance and transmittance of the nanoporous membrane were measured using optical pump-MWIR probe approach. The obtained results analyzed using thermal model formulated based on the analytical solution of the Green function. The experimental results were fitted using the model to separate the thermal reflectivity due lattice and plasma reflectivity of the nanoporous. Based on that, the temperature evolution, the thermal dissipation time as well as the thermoreflectance coefficient were extracted.