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Condensed Matter Seminar: Various Uses of Lasers in Thin Film Deposition, Nanoscale Heat Transport in Solids, Photodeactivation of Pathogenic Bacteria and Viruses in Human Blood, and Quantum Control Experiments

Date:
-
Location:
CP179
Speaker(s) / Presenter(s):
Ali Oguz Er (Western Kentucky University)
Various uses of lasers will be presented. A review of the nucleation and growth 
studies by Pulsed Laser Deposition (PLD) using in-situ reflection high energy electron 
diffraction (RHEED), atomic force microscopy (AFM), and scanning tunneling 
microscopy (STM) will be given. 
Nanoscale heat transport across the Cu/Ag(111) interface and the transient 
structural disorder in Ag(111) crystal after excitation of the 18 nm copper with 
femtosecond pulses was studied by means of time resolved X-ray diffraction. The lattice 
disorder after UV irradiation is detected by changes in peak shift and broadening of the 
XRD rocking curve. We have observed blast force and pressure wave propagation. 
The photo-inactivation rate of bacteria by methylene blue, MB, was found to be 
significantly lower in plasma than in water, saline, and PBS solutions. The spectroscopic 
data and ultrafast time resolved transient spectra and kinetics presented, show that 
methylene blue under continuous wave red light (~660 nm) photo-bleaches faster and to 
a larger degree in plasma and the MB excited singlet and triplet state populations in 
plasma are much lower in plasma than  in water and PBS solutions. 
Lastly, ongoing quantum control experiments by using femtosecond lasers in 
nonlinear media at Princeton University will be presented.