Abstract

Taking advantage of a non-uniformly biased graphene sheet, a novel electrically reconfigurable platform for sub-nanometer manipulation of nanoparticles (NPs) is proposed. Numerical simulations show that using a well-designed V-shaped back-gate contact, the graphene sheet can function as an inhomogeneous graphene strip with electrically tunable edges. Under certain conditions, localized surface plasmons (LSP) can be coupled to the induced edges, realizing strongly confined and enhanced edge-coupled LSP hot spots (trapping sites). Tuning the gate voltage tunes the induced edges and consequently the trapping sites with sub-nanometer resolution. Moreover, we demonstrate that using graphene strips (instead of a graphene sheet), the proposed structure can trap NPs in three dimensions and manipulate them in 2D. We believe this platform can open up exciting possibilities for future integrated reconfigurable lab-on-a-chip devices to accurately control the trapping sites, manipulate, route, and deliver NPs.

© 2023 Optica Publishing Group

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)

Numerical investigation of high-speed electrically reconfigurable plasmofluidic channels for particle manipulation

Mostafa Ghorbanzadeh
J. Opt. Soc. Am. B 37(10) 2830-2838 (2020)

Optical force conversion and conveyor belt effect with coupled graphene plasmon waveguide modes

Hao-yu Wang, Rui Ma, Gui-dong Liu, Ling-ling Wang, and Qi Lin
Opt. Express 31(20) 32422-32433 (2023)

Dispersion properties of plasmonic sub-wavelength elliptical wires wrapped with graphene

Mauro Cuevas and Ricardo A. Depine
J. Opt. Soc. Am. B 38(11) 3499-3508 (2021)

Tunable plasmonic tweezers based on graphene nano-taper for nano-bio-particles manipulation: numerical study

Ali Asghar Khorami, Behdad Barahimi, Sare Vatani, and Athar Sadat Javanmard
Opt. Express 31(13) 21063-21077 (2023)