title: Concentric Circular Grating Generated by the Patterning Trapping of Nanoparticles in an Optofluidic Chip.
abstract: Due to the field enhancement effect of the hollow-core metal-cladded optical waveguide chip, massive nanoparticles in a solvent are effectively trapped via exciting ultrahigh order modes. A concentric ring structure of the trapped nanoparticles is obtained since the excited modes are omnidirectional at small incident angle. During the process of solvent evaporation, the nanoparticles remain well trapped since the excitation condition of the optical modes is still valid, and a concentric circular grating consisting of deposited nanoparticles can be produced by this approach. Experiments via scanning electron microscopy, atomic force microscopy and diffraction of a probe laser confirmed the above hypothesis. This technique provides an alternative strategy to enable effective trapping of dielectric particles with low-intensity nonfocused illumination, and a better understanding of the correlation between the guided modes in an optical waveguide and the nanoparticles in a solvent.
authors.affiliation: The State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Department of Physics and Astronomy, Shanghai JiaoTong University, Shanghai, 200240, China.
authors.forename: Hailang
authors.initials: H
authors.lastname: Dai
authors.affiliation: The State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Department of Physics and Astronomy, Shanghai JiaoTong University, Shanghai, 200240, China.
authors.forename: Zhuangqi
authors.initials: Z
authors.lastname: Cao
authors.affiliation: The State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Department of Physics and Astronomy, Shanghai JiaoTong University, Shanghai, 200240, China.
authors.forename: Yuxing
authors.initials: Y
authors.lastname: Wang
authors.affiliation: The State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Department of Physics and Astronomy, Shanghai JiaoTong University, Shanghai, 200240, China.
authors.forename: Honggen
authors.initials: H
authors.lastname: Li
authors.affiliation: College of Physics &Communication Electronics, Jiangxi Normal University, Nanchang, Jiangxi, 330027, China.
authors.forename: Minghuang
authors.initials: M
authors.lastname: Sang
authors.affiliation: College of Physics &Communication Electronics, Jiangxi Normal University, Nanchang, Jiangxi, 330027, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Yuan
authors.affiliation: Photonlabs Company, Shanghai, 200240, China.
authors.forename: Fan
authors.initials: F
authors.lastname: Chen
authors.affiliation: The State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Department of Physics and Astronomy, Shanghai JiaoTong University, Shanghai, 200240, China.
authors.forename: Xianfeng
authors.initials: X
authors.lastname: Chen