Condensed-Matter Physics & Materials Science Seminar

"Optically detected ultrafast electronic and lattice processes of patterned plasmonic nanoparticles of different shapes"

Presented by Wenyu Huang, Georgia Institute of Technology, School of Chemistry and Biochemistry

Tuesday, January 23, 2007, 9:30 am — Small Seminar Room, Bldg. 510

Optically detected ultrafast electronic and lattice processes of patterned plasmonic nanoparticles of different shapes
Wenyu Huang
Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States

Metal (or plasmonic) nanoparticles have been extensively investigated in the last decade due to their tunable surface plasmon resonance (SPR) in the visible and near infrared region. It is known that many of their applications, such as optical nanowaveguides, electrical-field-enhanced spectroscopy, and biochemical sensors, are greatly related to the effects of interparticle interaction. Therefore, experimental and theoretical studies on interparticle interaction within well-defined metal nanostructures, fabricated by self-assembly or electron beam lithography (EBL) approaches, have recently attracted more and more interests.
However, most of the previous researches only focused on the interparticle interaction via far-field and near-field electromagnetic coupling and their effects on SPR using static optical spectroscopy. Here, using femtosecond polarized transient absorption spectroscopy, we study the effect of interparticle coupling on coherent phonon oscillation of prismatic gold and silver nanoparticles in assembled monolayer periodic arrays prepared with nanosphere lithography. Further study on the coupling is carried out on model systems of gold nanodisk pairs prepared with EBL, where the interparticle separation can be controlled at will. We find the interparticle interaction has intense effect on coherent lattice (phonon) properties of nanoparticles.

Hosted by: Masafumi Fukuto

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