Surface Plasmon Near-Field for Improved Optoelectronics and Photochemistry: Nano Seminar Series

Seminar | March 3 | 2-3 p.m. | 390 Hearst Memorial Mining Building

 Prof. Terefe G Habteyes, Univ. of New Mexico, Chemistry/Chemical Biology

 Berkeley Nanosciences and Nanoengineering Institute

Recent advances show that the near-field properties of localized surface plasmon resonances can be utilized to drive important photochemical reactions at low incident photon flux at room temperature as well as improve the efficiency of optoelectronic devices. Central to these applications is a localized surface plasmon near-field that increases light matter-interaction dramatically.

I will start the presentation with a brief discussion of plasmon near-field localization based on experimental results obtained in our lab using super-resolution near-field scanning optical microscopy. The distance dependent plasmon enhanced emission of quantum dots-in-a-well near-infrared emitters will be discussed as an example of the optoelectronic applications. Plasmon-driven photochemical reactions will be discussed based on our recent exciting experimental observations, where the remarkable effect of surface ligands is demonstrated, and a purely plasmon-driven demethylation reaction at very low incident photon flux is demonstrated.

The results provide important insight into the mechanism of plasmon-driven surface photochemistry, and at the same time, indicate the hidden chemistry on metal surfaces, where looking at molecules based on their fluorescence is no longer a possibility.

Prof. Habteyes did his PhD at the Univ of Arizona and postdoc here at UCB with Steve Leone and Paul Alivisatos, joining the UNM Center for High Technology Materials in 2012.