Prof. Xu’s research group focuses on combined
experimental and theoretical studies on laser-materials
particular, at the ultrafast time scale and nanometer spatial
scale. The research include
two distinct, yet related directions (1) nanoscale and ultrafast
energy transfer (this page), and (2)
laser-based micro- and nano-manufacturing and materials
processing (follow this link).
Research on Nanoscale and Ultrafast Energy Transfer utilizes
state-of-the-art laser systems and numerical tools to
investigate heat/energy transfer at micro and nanometer scales
and ultrafast (femtosecond to picosecond) time scales.
Current research projects are:
Ultrafast energy carrier (photons, electrons, phonons, etc.) dynamics in
nanoscale materials, particularly nano-engineered
thermoelectric and photovoltaic materials for energy conversion
applications. These studies employ an ultrafast laser
pump-and-probe experimental facility to investigate energy
transfer from photons to electrons to lattice heating. Coherent
phonon excitation and detection are used to understand ultrafast
interactions among energy carriers, scattering at interfaces and
boundaries, and the relation between phonon dynamics and global
energy transfer properties and energy conversion efficiencies.
Thermal properties measurements.
We employ photoacoustic
method and femtosecond thermal reflectance method to measure
thermal transport properties in thin films, bulk materials and
thermal resistance at interfaces. We have
provided measurement services to industries, academic
institutions, and government laboratories.
Fundamentals of heat/energy transfer in ultrafast-laser
We employ experimental and numerical tools to investigate
fundamentals in ultrafast-laser materials interactions,
including ultrafast pump-probe diagnostics and
molecular dynamics simulations.
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Prof. Xianfan Xu, Purdue University, all rights reserved.