Coupling in Plasmonic Systems and their Interaction with Moleucles

Adam Weissman Chemistry, BINA, Nano Center, Bar-Ilan University, Ramat-Gan, Israel Elad Segal Chemistry, BINA, Nano Center, Bar-Ilan University, Ramat-Gan, Israel Lihi Efremushkin Chemistry, BINA, Nano Center, Bar-Ilan University, Ramat-Gan, Israel Hannah Aharon Chemistry, BINA, Nano Center, Bar-Ilan University, Ramat-Gan, Israel Adi Salomon Chemistry, BINA, Nano Center, Bar-Ilan University, Ramat-Gan, Israel

Herein we demonstrate long range interaction between plasmonic modes of metallic nanocavities (holes). Upon coupling a strong nonlinearly response of the medium is observed and the signal is enhanced or suppressed and is dependent on the polarization of the incoming beam.

We further study the optical properties of molecules deposited on such metallic nanostructures with respect to the free molecules. We show experimentally and theorticallicy that molecular excited states can be strongly coupled to plasmonic modes. By tuning the plasmonic modes to be on/off resonance with respect to molecular excited state, one can modify the photophysical and even the chemical properties of these molecules.

Fig1. Polarization properties of triangular nano cavities upon coupling.

Left: SEM image of the structures right: Scanning of the nonlinear response (SHG) of the structures when the polarization of the incoming beam is along the x-axis.

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