title: Plasmonic graded nano-disks as nano-optical conveyor belt.
abstract: We propose a plasmonic system consisting of nano-disks (NDs) with graded diameters for the realization of nano-optical conveyor belt. The system contains a couple of NDs with individual elements coded with different resonant wavelengths. By sequentially switching the wavelength and polarization of the excitation source, optically trapped target nano-particle can be transferred from one ND to another. The feasibility of such function is verified based on the three-dimensional finite-difference time-domain technique and the Maxwell stress tensor method. Our design may provide an alternative way to construct nano-optical conveyor belt with which target molecules can be delivered between trapping sites, thus enabling many on-chip optofluidic applications.
authors.forename: Zhiwen
authors.initials: Z
authors.lastname: Kang
authors.forename: Haifei
authors.initials: H
authors.lastname: Lu
authors.forename: Jiajie
authors.initials: J
authors.lastname: Chen
authors.forename: Kun
authors.initials: K
authors.lastname: Chen
authors.forename: Fang
authors.initials: F
authors.lastname: Xu
authors.forename: Ho-Pui
authors.initials: HP
authors.lastname: Ho