| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2018) | |
| Energy Harvesting & Storage | Tuesday Sessions |
| Session EH-TuP |
| Session: | Energy Harvesting and Storage Poster Session |
| Presenter: | Jeffrey Braun, University of Virginia |
| Authors: | J. Braun, University of Virginia D. Olson, University of Virginia J. Gaskins, University of Virginia P. Hopkins, University of Virginia |
| Correspondent: | Click to Email |
We demonstrate a steady-state thermoreflectance based optical pump-probe technique to measure the thermal conductivity of materials using a continuous wave laser heat source. The technique works in principle on leaving a pump laser on long enough to induce a steady-state temperature rise in a material. A probe beam is then used to detect the resulting change in reflectance, which is proportional to the change in temperature of the sample. Varying the power of the pump beam to induce larger temperature rises, Fourier’s law is used to determine the thermal conductivity. We show that this technique is capable of measuring the thermal conductivity of a wide range of materials having thermal conductivities ranging from 1 to > 2000 W m−1K−1, in excellent agreement to literature values. With a measurement length scale capable of reaching <10 microns, this techniques is capable of measuring both bulk material and films.