中国激光, 2013, 40 (7): 0702007, 网络出版: 2013-06-25   

初级像差对角向偏振光深聚焦场的影响

Effect of Primary Aberration on Tight Focused Azimuthally Polarized Beams
作者单位
国防科学技术大学光电科学与工程学院, 湖南 长沙 410073
摘要
角向偏振光经深聚焦得到的轴对称环状光斑在粒子捕获和高分辨率成像等领域有重要应用,但是实际的深聚焦系统必然存在一些像差。基于Richards-Wolf矢量衍射积分理论,利用数值方法具体分析了五种初级像差对角向偏振光深聚焦场光强分布的影响。结果表明:球差、场曲不会破坏会聚场关于光轴旋转对称的特性,在实际焦面上仍可得到较为紧凑的中空光斑;畸变仅使焦面上的中空光斑位置发生偏移,但不改变其形状;像散会拉长中空光斑;彗差使光强向中空光斑的一边偏移,当彗差系数较大时,光斑中空特性消失。
Abstract
The symmetric dark core with a high intensity ring resulting from tight focusing of an azimuthally polarized beam plays a significant role in the fields of particle trapping and high-resolution imaging, etc. However, even in the well-corrected tight focusing optical systems, some aberrations inevitably occur. Numerical calculation is performed to analyze the influence of primary aberrations on the tight focusing properties of azimuthally polarized beams based on Richards-Wolf vector diffraction theory. The results show that the primary spherical aberration and the field curvature do not destroy the circular symmetry of the intensity distribution and a sharp high intensity ring can be obtained on the real focal plane. A positional displacement of the intensity ring takes place in the presence of primary distortion. The intensity ring is elongated in the presence of primary astigmatism. The primary coma tends to drive the intensity ring to move favorably on one side of the dark core, and the intensity null vanishes when the aberration coefficient becomes large.

任广森, 宁禹, 师宇斌, 许晓军. 初级像差对角向偏振光深聚焦场的影响[J]. 中国激光, 2013, 40(7): 0702007. Ren Guangsen, Ning Yu, Shi Yubin, Xu Xiaojun. Effect of Primary Aberration on Tight Focused Azimuthally Polarized Beams[J]. Chinese Journal of Lasers, 2013, 40(7): 0702007.

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