Authors: Mingrui Yuan Lin Cheng Pengfei Cao Xu Li Xiaodong He Xiaoping Zhang
Publish Date: 2017/03/10
Volume: 13, Issue: 2, Pages: 427-435
Abstract
We design a gold microracetrack resonator AuMRR which can tightly trap and drive the dielectric nanoparticle to rotate around the circuit of racetrack with an adjustable velocity Since the surface plasmon waves can be excited and obey the resonance condition of the AuMRR the optics force can be strengthened observably due to the resonance The optical forces applied on dielectric nanoparticle are discussed by utilizing the Maxwell’s stress tensor integration with a numerical finite element method The depth of longitudinal trapping potential well in the AuMRR is four times as large as that of a straight waveguide At the same level of input power the velocity of particle with radius of 50 nm driven by optical forces on AuMRR is 200 times larger than that on a straight waveguide Further we explore the motion behavior of single nanoparticle lies on different position of AuMRR which can provide the details to trap and manipulate multiple nanoparticles and predict their trace of movement This optimum geometry of AuMRR allows further enhancement of the optical forces which is expected to realize alloptical onchip manipulation of nanoparticles biomolecules and many other nanomanipulation applicationsThis work was partly supported by the Natural Science Foundation of Gansu Province No 1606RJZA068 and also supported by the Fundamental Research Funds for the Central Universities under Grant Nos lzujbky2016143 lzujbky2016138 and lzujbky2015306
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