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Aperiodic Vogel spirals for broadband optical wave focusing

机译:用于宽带光波聚焦的非周期性Vogel螺旋

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摘要

We demonstrate both experimentally and numerically a new type of hole array structure that exhibits optically diffractive focusing phenomenon. The hole arrays are designed based on the aperiodic Vogel spirals. In contrast to periodic and quasi-periodic hole arrays that contain discrete Bragg peaks in reciprocal space, the Vogel spiral hole arrays have particularly continuous Fourier components with circular symmetry, which enables optical wave focusing into a diffraction-limited hotspot for a wide range of incident wavelengths. We further demonstrate that the diffracted fields contain local orbital angular momentum (OAM) leading to rotations of the diffractive circular rings around the center, although the total OAM is zero. (c) 2018 Optical Society of America
机译:我们在实验和数字上展示了一种新型的孔阵列结构,其呈现光学衍射聚焦现象。 孔阵列是基于非周期性Vogel螺旋设计的。 与往复空间中的离散布拉格峰的周期性和准周期孔阵列相比,Vogel螺旋孔阵列具有特别连续的傅里叶组件,具有圆形对称性,使光波能够聚焦到衍射限制的热点中,以获得各种事件 波长。 我们进一步证明衍射场含有局部轨道角动量(OAM),其导致中心周围的衍射圆环的旋转,尽管总奥姆为零。 (c)2018年光学学会

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  • 来源
    《Optics Letters》 |2018年第24期|共4页
  • 作者单位

    Guangdong Prov Key Lab Opt Fiber Sensing &

    Commun Guangzhou 510632 Guangdong Peoples R China;

    Guangdong Prov Key Lab Opt Fiber Sensing &

    Commun Guangzhou 510632 Guangdong Peoples R China;

    Guangdong Prov Key Lab Opt Fiber Sensing &

    Commun Guangzhou 510632 Guangdong Peoples R China;

    Sun Yat Sen Univ State Key Lab Optoelect Mat &

    Technol Guangzhou 510275 Guangdong Peoples R China;

    Sun Yat Sen Univ State Key Lab Optoelect Mat &

    Technol Guangzhou 510275 Guangdong Peoples R China;

    Guangdong Prov Key Lab Opt Fiber Sensing &

    Commun Guangzhou 510632 Guangdong Peoples R China;

    Guangdong Prov Key Lab Opt Fiber Sensing &

    Commun Guangzhou 510632 Guangdong Peoples R China;

    Sun Yat Sen Univ State Key Lab Optoelect Mat &

    Technol Guangzhou 510275 Guangdong Peoples R China;

    Guangdong Prov Key Lab Opt Fiber Sensing &

    Commun Guangzhou 510632 Guangdong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
  • 关键词

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