title: Plasmonic optical trap having very large active volume realized with nano-ring structure.
abstract: The feasibility of using gold nano-rings as plasmonic nano-optical tweezers is investigated. We found that at a resonant wavelength of λ=785 nm, the nano-ring produces a maximum trapping potential of ~32k(B)T on gold nanoparticles. The existence of multiple potential wells results in a very large active volume of ~10(6) nm(3) for trapping the target particles. The report nano-ring design provides an effective approach for manipulating nano-objects in very low concentration into the high-field region and is well suited for integration with microfluidics for lab-on-a-chip applications.
authors.affiliation: Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, China.
authors.forename: Zhiwen
authors.initials: Z
authors.lastname: Kang
authors.forename: Haixi
authors.initials: H
authors.lastname: Zhang
authors.forename: Haifei
authors.initials: H
authors.lastname: Lu
authors.forename: Jianbin
authors.initials: J
authors.lastname: Xu
authors.forename: Hock-Chun
authors.initials: HC
authors.lastname: Ong
authors.forename: Ping
authors.initials: P
authors.lastname: Shum
authors.forename: Ho-Pui
authors.initials: HP
authors.lastname: Ho
mesh_terms: D006046:Gold / Q000737:chemistry; D053768:Metal Nanoparticles; D036103:Nanotechnology / Q000379:methods*; D052898:Optical Tweezers
chemical_list: D006046:Gold