Focused plasmonic trapping of metallic particles

被引:385
作者
Min, Changjun [1 ]
Shen, Zhe [1 ,2 ]
Shen, Junfeng [1 ]
Zhang, Yuquan [1 ]
Fang, Hui [1 ]
Yuan, Guanghui [3 ]
Du, Luping [3 ]
Zhu, Siwei [4 ]
Lei, Ting [5 ]
Yuan, Xiaocong [5 ]
机构
[1] Nankai Univ, Minist Educ China, Key Lab Opt Informat Sci & Technol, Inst Modern Opt, Tianjin 300071, Peoples R China
[2] Univ Liverpool, Dept Elect Engn & Elect, Liverpool L69 3GJ, Merseyside, England
[3] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
[4] Nankai Univ, Affiliated Hosp, Tianjin 300121, Peoples R China
[5] Shenzhen Univ, Coll Optoelect Engn, Inst Micro & Nano Opt, Shenzhen 518060, Peoples R China
基金
中国国家自然科学基金;
关键词
ENHANCED RAMAN-SPECTROSCOPY; GOLD NANOPARTICLES; OPTICAL MANIPULATION; RADIAL POLARIZATION; LASER-BEAM; GRADIENT; ARRAYS; FORCE; FILMS;
D O I
10.1038/ncomms3891
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Scattering forces in focused light beams push away metallic particles. Thus, trapping metallic particles with conventional optical tweezers, especially those of Mie particle size, is difficult. Here we investigate a mechanism by which metallic particles are attracted and trapped by plasmonic tweezers when surface plasmons are excited and focused by a radially polarized beam in a high-numerical-aperture microscopic configuration. This contrasts the repulsion exerted in optical tweezers with the same configuration. We believe that different types of forces exerted on particles are responsible for this contrary trapping behaviour. Further, trapping with plasmonic tweezers is found not to be due to a gradient force balancing an opposing scattering force but results from the sum of both gradient and scattering forces acting in the same direction established by the strong coupling between the metallic particle and the highly focused plasmonic field. Theoretical analysis and simulations yield good agreement with experimental results.
引用
收藏
页数:7
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