Topic: Fabrication and charaterization of Metallic Quantum Dot Based Nanocomposite Materials
Speaker:Dr. Richard Mu (Research Associate Professor, Fisk University )
Date & Time: Thursday, November 18, 1999, 1:00 P.M.
Place: Room 140 VMC
Metallic nanocrystal embedded in glassy and single crystal solids have shown many unusual electronic and optical (linear & nonlinear) properties with respect to their bulk counterparts. Both electronic and optical properties of metallic nanoparticles result from extreme spatial localization of the free electron gas inside the particles. The constraints in the physical dimension including the size and shape of nanocrystal themselves and the non-zero amplitude of the wave function outside of the nanoparticles of the confined small number of free electrons dictates that the optical properties of the nanoparticles can strongly influenced by the size and shape the nanoparticles as well as their confining media. Gold nanoparticles embeded in both MgO and Porous Vycor have been chosen as an example to illustrate how the size , shape, confining matrix as well as well as the very interface affecting the overall optical response of the Au nanocomposite materials. Further, a demonstration will be given to use picosecond pulsed laser as a unique and effective means to change the optical response of the nanoparticles in solids. This process may, in turn lead to optical device fabrication.
Dr. Richard Mu received his Ph.D. in condensed matter physics at SIU-C in 1992. Since 1994 he is a research associate professor at the center fo Photonic materials and Devices of Fisk University where he and Professor Henderson established the Chemical Physics laboratory. Currently, he is the Deputy Director of CPL which consist of five full-time research faculty. His research intrerst ranges from low dimensional metal and semiconductor fabrication s via pulsed laser ablation (PLA), thermal evaporations
Refreshments will be served at 1:45 P.M.