• home
• current students
• graduate
• events

Presenter: Ghazal Hajisalem
Supervisor: Dr. Reuven Gordon

Date: Tue, August 12, 2014
Time: 13:00:00 - 14:00:00
Place: ECS 660

ABSTRACT

Sponsored by: University of Victoria SPIE Student Chapter. Refreshment will be provided.

Abstract

Gold nanoparticles-thin metal film coupling separated with self-assembled monolayer (SAM) provides a convenient geometry to experimentally study the classical and quantum limits of plasmonic coupling in non-local regime. However, in this regime, surface roughness of the thin metal film can significantly influence the plasmonic coupling properties; therefore, using ultra-flat thin metal films was suggested. To study the far-field plasmonic coupling responses, the dark field scattering method was used that showed a blue-shift of the plasmonic coupling when reducing the thickness of spacer layer (gap). To study the near-field enhancement in this regime, we used third harmonic generation as a method that is very sensitive to the local field intensity. The onset to quantum tunneling regime was observed for gap thicknesses of 0.51 nm, where there was a sudden drop in the third harmonic when the gap width reduces from 0.69 nm to 0.51 nm. Prior to this drop, the third harmonic systematically increased as the gap thickness was decreased, as expected higher plasmonic focusing.