Optical force modulated by the charge transfer plasmons

Abstract

We have investigated the modulation of the trapping potential and trapping force provided by the graphene charge transfer plasmon (CTP) structure that supports two resonance modes. Both the screened bonding dipolar plasmon mode and the charge transfer plasmon mode greatly provide a strong trapping potential and trapping force. The position of the trapping potential well can be dynamically regulated by modulating the Fermi energy or the geometry of the charge transfer bridge, allowing for the dynamic trapping of the nanoparticles. The restricted Brownian motion trajectory of the nanoparticles near the structure indicates that both modes can achieve stable nanoparticles trapping. These two peculiar resonance modes could potentially open up additional possibilities for optical manipulation and particle sorting.