Tight focusing of the azimuthally polarized light beam for a sharper spot

被引：13
|
作者：
Cheng, Zao [1 ]
Zhou, Yiyu [1 ]
Xia, Min [1 ]
Li, Wei [1 ]
Yang, Kecheng [1 ]
Zhou, Yifeng [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China
来源：
OPTICS AND LASER TECHNOLOGY | 2015年 / 73卷
基金：
中国国家自然科学基金;
关键词：
Diffraction theory; Laser beam shaping; Polarization; CYLINDRICAL-VECTOR BEAMS; NEAR-FIELD OPTICS; NUMERICAL APERTURE; FOCAL SPOT; LENS; NEEDLE; ILLUMINATION; MICROSCOPY; RESOLUTION; SYSTEM;
D O I：
10.1016/j.optlastec.2015.04.013
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
This paper presents a method to focus azimuthally polarized vortex light beam by the combination of a vortex phase plate, a binary-phase optical element (BOE) and a high-numerical aperture (NA) objective lens. Our proposed method achieves a smaller spot size than other polarized beams under the same condition. Compared to the system with the annular aperture, the minimum of full width at half-maximum is improved to 0.259 lambda and the energy conversion efficiency is higher in the proposed method when FWHM <0.284 lambda. The Strehl Ratio of the focused spot always exceeds 10%. The impact of changing the BOE's structure and parameters on focusing results is also discussed. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：77 / 81
页数：5
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