Xu Research Group |
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Prof. Xu’s group carries out research in two main areas: (1) nanoscale energy transport, and (2) nano-optics and laser-based nano-optical engineering.
(1) Nanoscale energy transport
We investigate energy transport in nanoscale materials used for efficient energy conversion, including photovoltaic and thermoelectric energy conversion, and nanoscale materials for controlling - reducing or enhancing - thermal transport in nanoscale devices. At a microscopic level, energy transport and conversion is ultimately determined by the dynamics of interactions among basic energy carriers such as electrons, phonons, and photons, which occur at a time scale of femtosecond (fs, 10^-15 s) to picosecond (ps, 10^-12 s). We develop advanced femtosecond (fs) laser based high temporal (~ 10 fs) resolution experimental techniques (e.g., coherent phonon spectroscopy), Raman spectroscopy based thermometry, and high resolution (~ 10 nm) scanning probe based thermometry for the study of nanoscale energy transfer and conversion processes.
Current research projects include (details see Research Projects): - Energy transport in 2D materials and nanoelectronic devices - Near field radiation - Ultrahigh resolution temperature mapping - Energy transport in thermoelectric materials for waste heat recovery from automobile exhaust gas
Also see Test Rig for TEG performance evaluation Also see News Release: Technology uses auto exhaust heat to create electricity, boost mileage
(2) Nano-optics and laser-based nano-optical engineering
We are working on a broad range of topics related to nano-optics and nano-optical engineering. Our current effort is on laser-based nano-engineering using nanoscale optical antennas, which are developed in our laboratory. These antennas are capable of efficiently focusing light into a nanometer domain with intensity orders of magnitude higher than the incoming light intensity. Being able to concentrate light into a nanoscale domain with high intensity has numerous applications in nano-manufacturing, nanoscale imaging and diagnostics, and ultra-high density data storage. We also utilize femtosecond two-photon processes to develop rapid 3D nanoscale printing technologies.
Current projects in this area include (see details by following the link): -
Femtosecond rapid 3D printing - Near-field scanning optical microscopy - Parallel nanomaterials synthesis using nanoscale optical antenna and device development - High density data storage using nanoscale optical antenna
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Copyright © 2010,
Prof. Xianfan Xu,