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Cylindrically polarized perfect optical vortex: Generation and focusing properties
Optics Communications ( IF 2.4 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.optcom.2020.125693
M.Á. Olvera-Santamaría , J. García-García , A. Tlapale-Aguilar , J. Silva-Barranco , C. Rickenstorff-Parrao , A.S. Ostrovsky

Abstract In this paper we extend the concept of perfect optical vortex to the vector case and investigate its focusing properties in the high numerical aperture regime. We show that simultaneous phase encoding of orthogonal components can be realized by means of a 4 f imaging system incorporating a phase only liquid-crystal spatial light modulator whose director axis is rotated 45° with respect to the horizontal axis. As an example of application, we demonstrate theoretically and experimentally that a ring-shaped field with inner radius of 0.15 λ can be obtained by focusing a radially polarized perfect vortex and a tight spot of 0.34 λ FWHM can be obtained by focusing an azimuthally polarized perfect vortex.

中文翻译:

圆柱偏振完美光学涡旋:产生和聚焦特性

摘要 在本文中,我们将完美光学涡旋的概念扩展到矢量情况,并研究了其在高数值孔径范围内的聚焦特性。我们表明,正交分量的同时相位编码可以通过 4 f 成像系统实现,该系统结合了仅相位液晶空间光调制器,其指向矢轴相对于水平轴旋转 45°。作为应用实例,我们从理论上和实验上证明,通过聚焦径向偏振完美涡旋可以获得内半径为 0.15 λ 的环形场,通过聚焦方位偏振完美涡旋可以获得 0.34 λ FWHM 的紧点。涡流。
更新日期:2020-07-01
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