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

Numerical investigation of bidirectionally tunable, nanometer-precise, and compact tweezers for screening gold nanoparticles

Mostafa Ghorbanzadeh
J. Opt. Soc. Am. B 38(4) 1235-1242 (2021)

Optimizing optical trap stiffness for Rayleigh particles with an Airy array beam

Rafael A. B. Suarez, Antonio A. R. Neves, and Marcos R. R. Gesualdi
J. Opt. Soc. Am. B 37(2) 264-270 (2020)

Small footprint symmetrical graphene hybrid plasmonic waveguides for high-speed broadband optical modulation

K. B. M. Rakib Hasan, Md. Asiful Islam, and M. Shah Alam
J. Opt. Soc. Am. B 37(9) 2696-2706 (2020)

Effective multiple optical trapping of sub-micrometer particles with petal beams

V. Shahabadi and E. Madadi
J. Opt. Soc. Am. B 37(12) 3665-3671 (2020)

Sensing and switching capabilities of a graphene-based perfect dual-band metamaterial absorber with analytical methods

Mohamad Nejat and Najmeh Nozhat
J. Opt. Soc. Am. B 37(5) 1359-1366 (2020)