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Ultrafast dynamics in solids

GeSb thin films: read-write optical data storage on the subnanosecond time scale., at Ultrafast Electronics and Optoelectronics 2001, Optical Society of America (Lake Tahoe, NV), Thursday, January 11, 2001:
talk_364.pdf
The transition from the low reflectivity amorphous to the highly reflective crystalline phase of a-GeSb films is studied with fs time resolution. The results reveal an ultrafast transition to a new non-thermodynamic phase which is not c-GeSb as previously believed.
Quick as a Flash: Observing Ultrafast Laser-Induced Dynamics in Semiconductors, at Physics Colloquium, University of Massachusetts at Lowell (Lowell, MA), Wednesday, April 21, 1999:
talk_274.pdf
We track laser-induced phase changes in materials on ultrafast time scales by measuring the material's dielectric function (from near-UV to near-IR) with 100-fs time resolution. Experiments on GaAs excited with intense femtosecond pulses reveal details of the ultrafast electron and lattice dynamics at large excited carrier densities. Future experiments will use our technique to measure the plasma dynamics during femtosecond laser-induced breakdown of transparent materials, a process which has been shown to have several potential applications in micro-machining and data storage.
Ultrafast Lattice-Bonding Dynamics of Tellurium, at Ultrafast Electronics and Optoelectronics 2003 Conference (Washington, DC), Wednesday, January 15, 2003:
talk_453.pdf
A pump-probe technique measuring the dielectric function is presented and applied to the ultrafast dynamics of coherent phonons in Te. Oscillations in the bonding-antibonding splitting are revealed, allowing for THz modulation of a semiconductor-semimetal transition.
Nano hemi-shell arrays produced by femtosecond laser micro-processing for SERS applications, at Photonics West 2009 (San Jose, CA), Tuesday, January 27, 2009
Nano-scale periodic structures produce a greatly enhanced near-field at the surface and therefore they are very promising for applications involving Surface Enhanced Raman Scattering (SERS). The ideal shape of the structure is a sphere, a rod, a needle or a hemi-shell. Nano hemi-shell structures obtained by evaporating a thin metal film on small dielectric particles, in particular, have attracted much attention, because their resonant wavelength can be easily tuned by controlling the thickness of the metal film, shells diameter, or the distance between particles. Furthermore, the dielectric... Read more about Nano hemi-shell arrays produced by femtosecond laser micro-processing for SERS applications

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