Optical force conversion and conveyor belt effect with coupled graphene plasmon waveguide modes
Haoyu Wang, Rui Ma, Guidong Liu, Lingling Wang, Qi Lin
Abstract
We propose a double-layer graphene sheets side coupling to a strip of graphene to obtain the optical pulling or pushing force. Combined with coupled mode theory and finite-difference time-domain simulations, it is found that the conveyor belt effect can be realized in conjunction with the lateral optical equilibrium effect upon the radiation loss κ e equal to the intrinsic loss κ o . The maximum total optical force acting on the strip in the symmetric mode (S-mode) can be up to ∼5.95 in the unit of 1/ c and the anti-symmetric (AS-mode) mode reach ∼2.75 1/ c . The optical trapping potential U x and optical trapping force F x for the S-mode have a value around -22.5 k B T/W and 240 pN/W, while for the AS-mode can up to ∼-56 k B T/W and 520 pN/W, respectively. Our work opens a new avenue for optical manipulation with potential applications in optoelectronic devices and lab-on-a-chip platforms.