Visualizing orbital angular momentum of plasmonic vortices

被引：68
|
作者：
Shen, Z. [1 ]
Hu, Z. J. [2 ]
Yuan, G. H. [3 ]
Min, C. J. [1 ]
Fang, H. [1 ]
Yuan, X-C. [1 ]
机构：
[1] Nankai Univ, Key Lab Opt Informat Sci & Technol, Minist Educ China, Inst Modern Opt, Tianjin 300071, Peoples R China
[2] Natl Ctr Nanosci & Technol, CAS Key Lab Standardizat & Measurement Nanotechno, Beijing 100190, Peoples R China
[3] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
来源：
OPTICS LETTERS | 2012年 / 37卷 / 22期
基金：
中国国家自然科学基金; 新加坡国家研究基金会;
关键词：
PHASE SINGULARITY; LIGHT; BEAMS; POLARIZATION; PARTICLES; LENS;
D O I：
10.1364/OL.37.004627
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Plasmonic vortices (PVs) are generated by focusing a radially polarized optical vortex (OV) beam onto a metal surface. The intensity distribution of the PV is registered with a near-field scanning optical microscopy and agrees well with a theoretical prediction as well as numerical calculation. Beside the dark central spot, the numerical calculation also shows an azimuthal Poynting vector belonging to the PV, implying that the orbital angular momentum (OAM) was transferred from the radially polarized OV. To directly verify the OAM, plasmonic trapping experiments with gold micrometer particles are performed and the particle rotation is visualized. Further experiments by varying the topological charge of radially polarized OVs show the corresponding changes in rotation in terms of speed and radius. (C) 2012 Optical Society of America
引用
收藏
页码：4627 / 4629
页数：3
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