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Rotating vectorial vortices produced by space-variant subwavelength gratings

机译:空变亚波长光栅产生的旋转矢量涡流

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摘要

A new class of vectorial vortex based on coherent addition of two orthogonal circularly polarized Bessel beams of identical order but with different propagation constants is presented. The transversely spacevariant axially symmetric polarization distributions of these vectorial fields rotate as they propagate, while they maintain a propagation-invariant Bessel intensity distribution. These properties were demonstrated by use of discrete space-variant subwavelength gratings for 10.6 (mu)m CO_(2) laser radiation. The polarization properties were verified by both full space-variant polarization analysis and measurements. Rotating intensity patterns are also demonstrated by transmitting the vectorial vortices through a linear polarizer.
机译:提出了一种新的矢量涡旋,其基于相干相加但具有相同传播常数的两个正交圆偏振贝塞尔光束的相干相加。这些矢量场的横向时变轴向对称分布在其传播时会旋转,同时保持传播不变的贝塞尔强度分布。这些特性通过使用离散空间变异亚波长光栅用于10.6μmCO_(2)激光辐射来证明。通过全空间变量偏振分析和测量来验证偏振特性。通过将矢量涡旋通过线性偏振器也可以证明旋转强度的变化。

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