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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><p class=MsoPlainText>postponed due to weather conditions,<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>***** Colloquium *****<o:p></o:p></p><p class=MsoPlainText>Center for Integrated Bio and Nano Systems Houston Chapter of IEEE Nanotechnology Council and Houston Chapter of IEEE Magnetics Society <o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Ultrafast and Nonlinear Optical Spectroscopy of Carbon Nanotubes, <o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Junichiro Kono, Departments of Electrical & Computer Engineering and Physics & Astronomy, Rice University<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Single-walled carbon nanotubes (SWNTs) provide a variety of new opportunities for probing exotic physics of one-dimensional (1-D) electrons and phonons. At the same time, they possess unique properties that are promising for future applications in optoelectronics. This talk will describe our recent ultrafast and nonlinear optical experiments on SWNTs, revealing novel properties of high-density 1-D excitons as well as lattice vibrations. We have shown that there exists an upper limit on the density of 1-D excitons in SWNTs, which results in photoluminescence saturation. Using a model based on diffusion-limited exciton-exciton annihilation, we provided realistic estimates for the exciton densities in the saturation regime.<o:p></o:p></p><p class=MsoPlainText>Using ultrashort pulses, we have also investigated the dynamics of coherent phonons (CPs) in SWNTs, including both the low frequency radial breathing mode and high frequency G-mode phonons. Pulse shaping techniques allowed us to generate and detect CPs in SWNTs in a chirality-selective manner, which provided insight into the chirality dependence of light absorption, phonon generation, and phonon-induced band-structure modulations.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Junichiro Kono received his B.S. and M.S.<o:p></o:p></p><p class=MsoPlainText>degrees in applied physics from the University of Tokyo in 1990 and 1992, respectively, and completed his Ph.D. in physics from the State University of New York at Buffalo in 1995. He was a postdoctoral research associate in condensed matter physics at the University of California, Santa Barbara in 1995-1997 and the W. W. Hansen Experimental Physics Laboratory Fellow in the Department of Physics at Stanford University in 1997-2000. He joined the Department of Electrical and Computer Engineering of Rice University in 2000 as an Assistant Professor and was promoted to Associate Professor in 2005.<o:p></o:p></p><p class=MsoPlainText>Since 2009, he has been a Professor in the Departments of Electrical& Computer Engineering and Physics& Astronomy at Rice University.<o:p></o:p></p><p class=MsoPlainText>Kono's current research interests include optical studies of low-dimensional systems; spintronics and quantum information processing; nonlinear, ultrafast, and quantum optics in solids; phenomena in ultrahigh magnetic fields; and terahertz phenomena in semiconductors.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Contact Prof. Jiming Bao (<a href="mailto:jbao@uh.edu%3cmailto:jbao@uh.edu">jbao@uh.edu<mailto:jbao@uh.edu</a>>) if you would like to arrange for a time to meet with Dr. Kono.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-family:"Cambria","serif"'>Dr. Jiming Bao<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Cambria","serif"'>Department of Electrical and Computer Engineering<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Cambria","serif"'>The University of Houston<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Cambria","serif"'>Houston, TX 77204-4005 <o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Cambria","serif"'>Phone: +1 713-743-4456, Fax: +1 713-743-4444 <o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Cambria","serif"'>Email: jbao@uh.edu, http://www2.egr.uh.edu/~jbao<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>