[printer friendly version]

AMO/QO SEMINAR SERIES


"Photocurrent, Photovoltage, and Optical Magnetism in Plasmonic Metals"


Dr. Matthew T. Sheldon
Chemistry Department, Texas A&M University

ABSTRACT 

Fundamentally, plasmon oscillations are an opto-mechanical phenomenon. Incident optical fields induce coherent the motion of electrons to produce large fluctuations of charge density at "hot spots" in resonant metal nanostructures. Our laboratory is interested in how this coherent motion at optical frequencies can be rectified, or otherwise leveraged to generate large photovoltages or photocurrents, as a platform for all-metal alternatives to traditional semiconductor photovoltaics. In this talk I will discuss our recent time-resolved studies showing remarkable plasmonic enhancement ( > 1000x ) of the of optically-induced magnetic fields in plasmonic metal nanoparticles due to the inverse Faraday effect, as well as the concomitant macroscopic drift currents from electrons that circulate these resonant geometries during circularly polarized optical excitation. I will also discuss our recent progress implementing thermionic power converters based on non-equilibrium "hot electrons" produced via Landau damping of plasmon oscillations.


Tuesday, March 26, 2019
IQSE Seminar Room, 12:00 Noon
(578 MPHY)


Institute for Quantum Science and Engineering
Texas A&M University

Sandwich lunch to be served at 11:30 a.m.

Host: Dr. Marlan Scully