Large scale manipulation of the dark spot by phase modulation of azimuthally polarized light
Large scale manipulation of the dark spot by phase modulation of azimuthally polarized light
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通过方位角偏振光的相位调制大规模操纵暗点
DOI：
10.1016/j.optcom.2015.03.024
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发表时间：
2015-08-15
影响因子：
2.4
通讯作者：
Luo, Xiangang
中科院分区：
文献类型：
--
作者：
Chen, Weiguo;Wang, Jiong;Luo, Xiangang
提出了一种在高数值孔径透镜系统下将方位角偏振光聚焦成超小或超大暗斑的新方法。通过设计合理的二进制0-pi相板，无论副瓣强度如何，都能产生一个超小的黑斑，主瓣峰峰距离缩小到0.24 λ，是无相板情况下的46%。针对潜在的应用，分析了压缩黑斑和抑制旁瓣强度的方法，并给出了几种不同旁瓣强度的压缩黑斑的情况。此外，本文还研究了采用双区相片放大暗斑的方法，在主瓣峰峰距离为100% ~ 200%的范围内，可以很容易地获得放大后的暗斑。该方法的优点是对暗斑大小的大规模控制和对副瓣强度的高效抑制，对光学镊子和受激发射耗尽（STED）显微镜等系统的性能提高具有重要价值。(C) 2015 Elsevier B.V.版权所有
A new method is proposed to focus azimuthally polarized beam into an ultra-small or ultra-big dark spot under high numerical aperture lens system. Manipulated by proper designed binary 0-pi phase plate, an ultra small dark spot regardless of side-lobe intensity is generated with main-lobe peak to peak distance shrunk to 0.24 lambda, which is 46% of the case without phase plate. For potential applications, shrinking the dark spot and suppressing the side-lobe intensity are analyzed, and several cases of squeezed dark spots with different levels of side-lobe intensities are presented. Additionally, using a two-zone phase plate to enlarge the dark spot is investigated in this paper, and an enlarged dark spot is readily acquired with the main-lobe peak to peak distance in a range of 100%-200%. The advantages of this method are its large scale manipulation of the dark spot size and its high performance in suppressing side-lobe intensity, which is of great worth in enhancing the performance of many systems such as optical tweezers and stimulated emission depletion (STED) microscope. (C) 2015 Elsevier B.V. All rights reserved.