Phonon hydrodynamics in frequency-domain thermoreflectance experiments

Broadband phonon mean free path contributions to thermal conductivity measured using frequency domain thermoreflectance.

Non-metallic crystalline materials conduct heat by the transport of quantized atomic lattice vibrations called phonons. Thermal conductivity depends on how far phonons travel between scattering events-their mean free paths. Due to the breadth of the phonon mean free path spectrum, nanostructuring materials can reduce thermal conductivity from bulk by scattering long mean free path phonons, wher...

Characterization of thin metal films via frequency-domain thermoreflectance

Frequency-domain thermoreflectance is extended to the characterization of thin metals films on low thermal diffusivity substrates. We show how a single noncontact measurement can yield both the thickness and thermal conductivity of a thin metal film with high accuracy. Results are presented from measurements of gold and aluminum films 20–100 nm thick on fused silica substrate. The thickness mea...

Parametric study of the frequency-domain thermoreflectance technique

A compact heat transfer model based on an enhanced Fourier law for analysis of frequency-domain thermoreflectance experiments

A frequency-domain thermoreflectance method for the characterization of thermal properties.

A frequency-domain thermoreflectance method for measuring the thermal properties of homogenous materials and submicron thin films is described. The method can simultaneously determine the thermal conductivity and heat capacity of a sample, provided the thermal diffusivity is greater, similar3x10(-6) m(2)/s, and can also simultaneously measure in-plane and cross-plane thermal conductivities, as ...