Prof. Luat T. Vuong (UC Riverside) - CaSTL Seminar

Thursday, February 7, 2019 - 13:00
2201 Natural Science II
Luat T. Vuong, Assistant Professor, Mechanical Engineering | UC Riverside
Event Title: 
Chiral Scattering, Photo-induced Voltages and Forces in Achiral Plasmonic Systems
CaSTL Center | V. Ara Apkarian, Director

Luat T. Vuong


SUMMARY BIO:Luat has an undergraduate degree in Engineering Physics from UC Berkeley, and received her Ph.D. in Applied Physics at Cornell, studying optical vortex collapse and filamentation dynamics in Alexander L. Gaeta's Quantum and Nonlinear Photonics Group. With a Fulbright in 2007, she joined the Delft University of Technology Optics Group in the Netherlands, where she studied the near-field scattering in plasmonic structures.  She segued into research on nanostructured organic photovoltaics at ICFO- The Institute of Photonic Sciences in Spain with a European Commission MC-IIF Postdoctoral Fellowship. Luat is a 2012 recipient of the NSF Career Award and co-chair for a Gordon Research Conference that she has recently initiated, "Plasmonically Powered Processes", to take place next in Hong Kong, 2019

Astract  Today, our knowledge of the light-induced forces on small objects is relevant to research across many disciplines. The technology for optically trapping biological specimens is mature; however, the predictive control of the light-induced forces on metals or conducting nanomaterials has not yet been achieved.


Prof. Vuong will discuss the chiral scattering of light and the nonlinear Lorentz force in achiral plasmonic structures, which result in polarization-dependent nanoscale electrical potentials and mechanical forces. These forces significantly influence both microscale and macroscopic dynamics through the production of local voltages or forces, and may also influence hot electron effects. We provide experimental, theoretical, and new numerical results that demonstrate ultra-long-range self-assembly via plasmon-induced forces.  Our results are relevant to nascent models of plasmonically-powered processes.


Figure: Polarization-dependent hotspots (color) and gradient forces (arrows) produced by left and right-handed circularly-polarized light (LCP and RCP) on gold nanopores, 500-nm diameter.