Abstract

Exploiting the uniquely tunable optical response and the strong optical Kerr nonlinearity of a graphene sheet conjugated by the propagating leaky surface plasmons (SPs) excited on top of gold (Au) stripes, an efficient and high-speed electrically reconfigurable plasmonic tweezer is presented. It is demonstrated that using a number of electrically and optically isolated Au stripes and topped graphene, metallic, and dielectric nanoparticles (NPs) can be trapped, sensed, guided, and sorted in a controllable manner. Also, numerical simulations show that at high enough SP fields, the fundamental SP mode is laterally self-focused by an induced laterally graded refractive index and consequently experiences weaker edge effects. It is shown that a more confined and enhanced SP mode in the nonlinear regime is beneficial to trapping and sensing applications. The proposed stacked structure of a nonpatterned graphene sheet and Au stripes offers an efficient and powerful method for developing reconfigurable plasmofluidic channels in controlling the trajectory of label-free NPs.

© 2020 Optical Society of America

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