Dear all, Below are two seminars that will be held tomorrow, July 31st. July 31, 2012 @ 1:00pm, BRK, ROOM 1001 Alexei Sergeevich Lagutchev Postdoc Research Associate, Department of Chemistry University of Illinois at Urbana-Champaign Title: Femtosecond Sum Frequency Spectroscopy Monitoring of Monolayers Subject to Extreme Conditions Bio: Born in Moscow, USSR, Aug.24th 1959. 1982 MS from Moscow State University, Physics Department, General Physics and Nonlinear Optics Division. "Nonlinear distortions and methods of their elimination during laser beam propagation through the atmosphere in the presence of the random wind." 1992 Ph.D. physics/math from Institute of General Physics, Moscow. "Laser Action on the Volume Gas Flow in Capillaries". New method of laser-assisted gas-mixtures separation was proposed and investigated both experimentally and by means of computer simulation. 1993-1997 PostDoc, Surface Chemistry and Spectroscopy Group, Institute of Atomic and Molecular Sciences, Academia Sinica, Taiwan R.O.C. Experimental sum-frequency generation spectroscopy of mixed aliphatic monolayers. 1997- present PostDoc, Research Associate, Department of Chemistry, University of Illinois at Urbana-Champaign. Sum-frequency generation study of shock wave interaction with matter and electrochemical processes. Abstract: Presented are experimental results and challenges arising in using sum frequency generation spectroscopy (SFG) for real-time monitoring of extreme pressures and ultrafast temperature jumps generated with femtosecond laser pulses. Discussed in detail are the problems arising in the design of experimental apparatus, SFG spectra interpretation, achieving good time resolution, pressure and temperature calibration. Demonstrated is the possibility of generating controllable pressure waves with rise times of few picoseconds and amplitude of several GPa. We show how SFG monitoring of flash heating of long molecular chain tails could be used for direct measurement of heat propagation rate along the single molecule. It also appears that SFG measurements could be successfully complemented with SERS monitoring of the vibrational spectra of the monolayers. These studies are aimed at achieving new insights on chemistry of initiation of energetic materials and intramolecular energy transfer involved in such processes. [cid:image001.png@01CD6E45.C5C281F0] July 31st, 2012 @ 2:30 pm, BRK, ROOM 2001 Dr. Yi Xuan Postdoctoral Research Associate Birck Nanotechnology Center Purdue University Title: Fabrication Strategies for Nanophotonic Applications ABSTRACT: Three dimensional photonic crystals have unique electromagnetic properties that give us the ability to trap light in air surrounded by high index material. This talk will focus on the fabrication of such a structure and also highlight the fabrication challenges met in realizing membrane based photonic crystals. Jaime Turner Birck Nanotechnology Center Purdue University 1205 West State STreet West Lafayette, IN 47907-2057 (765) 494-3509 jjturner@purdue.edu
