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傅里叶域中的光线

张书赫 邵梦 张盛昭 周金华

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傅里叶域中的光线

张书赫, 邵梦, 张盛昭, 周金华

Light rays in Fourier domain

Zhang Shu-He, Shao Meng, Zhang Sheng-Zhao, Zhou Jin-Hua
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  • 建立普适的理论模型用于描述光线和光波场的关系是几何光学领域中重要的研究内容. 本文基于传统几何光学与傅里叶光学原理, 提出利用光波场的傅里叶角谱得到光束的光线模型, 反之可以根据光线模型反演光场的傅里叶角谱. 以Airy光束以及Cusp光束为例, 展示了利用傅里叶角谱构建光束光线模型的方法及其正确性; 进一步展示利用光线构建焦点处的光波场的傅里叶频谱分布, 然后通过逆变换得到光波场的空间分布, 并与Debye方法取得了相同的结果; 最后从空间坐标域以及空间频率域给出了光线模型的高维解释, 以聚焦光束、Airy光束以及二次梯度折射率波导中的光线为例展示了高维光线模型的物理内涵. 理论分析表明, 传统几何光学构建的光线模型只是高阶光线模型在实空间内的投影.
    Establishing a universal model to characterize the relationship between light rays and optical waves is of great significance in optics. The ray model provides us with an intuitive way to study the propagation of beams as well as their interaction between objects. Traditional ray model is based on the normal of a beam wave front. The normal vector is defined as the direction of ray. However, it fails to describe the relationship between light ray and optical wave in the neighborhood of focus or caustic lines/surface since light ray in those regions are no longer perpendicular to the wavefront. In this work, the ray model of a light beam is built according to its Fourier angular spectrum, where the positions of rays can be determined by the gradient of the phase of the Fourier angular spectrum. On the other hand, the Fourier angular spectrum of a light beam can be reconstructed through the ray model. Using Fourier angular spectra, we construct the ray model of two typical beams including the Airy beam and the Cusp beam. It is hard to construct ray model directly from the optical field of these beams. In this ray model, the information about ray including direction and position involves the propagation properties of light beams such as self-accelerating. In addition, we demonstrate that the optical field of the focused plane wave can be reconstructed by the ray model in Fourier regime, and the optical field in spatial domain can be obtained by inverse Fourier transform. Simulation results are consistent with the results from Debye’s method. Finally, the high-dimensional ray model of light beams is elaborated in both spatial and spectral regime. Combined with focused plane wave, Airy beam and rays in quadratic gradient-index waveguide, our results show that the ray model actually carries the information about optical field in both spatial and Fourier domain. Actually, the traditional ray model is just a spatial projection of the high-dimensional ray model. Hence, when traditional ray model fails at the focus or caustic lines/surface, it is able to obtain the spectrum of the corresponding optical field from the Fourier domain, and then obtain the field distribution in spatial domain by inverse Fourier transform.
      通信作者: 周金华, zhoujinhua@ahmu.edu.cn
    • 基金项目: 安徽省自然科学基金(批准号: 1908085MA14)、安徽省转化医学研究院科研基金(批准号: 2017zhyx25)、安徽医科大学博士科研资助基金(批准号: XJ201812)和安徽医科大学校科研基金(批准号: 2018XKJ013)资助的课题
      Corresponding author: Zhou Jin-Hua, zhoujinhua@ahmu.edu.cn
    • Funds: Project supported by the Natural Science Foundation of Anhui Province, China (Grant No. 1908085MA14), the Scientific Research Foundation of the Institute for Translational Medicine of Anhui Province, China (Grant No. 2017zhyx25), the Scientific Research of BSKY from Anhui Medical University, China (Grant No. XJ201812), and the Scientific Research of XKJ from Anhui Medical University, China (Grant No. 2018XKJ013)
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    玻恩 M, 沃耳夫 E 著 (杨薛荪 译) 2005 光学原理 (北京: 电子工业出版社) 第403页

    Born M, Wolf E (translated by Yang X S) 2005 Principle of Optics (Beijing: Publishing House of Electronics Industry) p 403 (in Chinese)

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    Kaganovsky Y, Heyman E 2010 Opt. Express 18 8440

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    马亮, 吴逢铁, 黄启禄 2010 光学学报 30 2417

    Ma L, Wu F T, Huang Q L 2010 Acta Opt. Sin. 30 2417

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    Alonso M A, Dennis M R 2017 Optica 4 476Google Scholar

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    Bouchard F, Harris J, Mand H, Boyd R W, Karimi E 2016 Optica 3 351Google Scholar

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    左超, 陈钱, 孙佳嵩, Asundi A 2016 中国激光 43 0609002

    Zuo C, Chen Q, Sun J S, Asundi A 2016 Chin. J. Lasers 43 0609002

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    吕乃光, 金国藩, 苏显渝 2016 傅立叶光学 (北京: 机械工业出版社) 第73页

    Lü N G, Jin G P, Su X Y 2016 Fourier Optics (Beijing: China Machine Press) p73 (in Chinese)

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    Siviloglou G A, Christodoulides D N 2007 Opt. Lett. 32 979Google Scholar

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    Gong L, Liu W W, Ren Y X, Lu Y, Li Y M 2015 Appl. Phys. Lett. 107 231110Google Scholar

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    Berry M V, Balazs N L 1979 Am. J. Phys. 47 264Google Scholar

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    Alonso M A, Forbes G W 2002 Opt. Express 10 728Google Scholar

  • 图 1  平行光经透镜聚焦后产生锥形光线 (a)光线追踪示意图; (b)光锥的简化光线模型

    Fig. 1.  Ray cone that produced by convergent parallel rays through a lens: (a) Sketch of ray-tracing; (b) simplified ray model of ray cone.

    图 2  不同横截面处Airy光束的光线分布, 其中(a) $z = - 180\;{\text{μm}}$, (b) $z = - 100\;{\text{μm}}$, (c) $z = 0\;{\text{μm}}$, (d) $z = 100\;{\text{μm}}$, (e) $z = 180\;{\text{μm}}$; 背景色为归一化的光强分布; 灰色点为光线起点, 红色箭头为光线在xoy面投影矢量, 长度正比于光线与z轴的夹角大小; (f) Airy光束的光线模型; 不同颜色用以区分不同位置的光线

    Fig. 2.  Ray model of Airy beam at (a) $z = - 180\;{\text{μm}}$, (b) $z = - 100\;{\text{μm}}$, (c) $z = 0\;{\text{μm}}$, (d) $z = 100\;{\text{μm}}$, and (e) $z = 180\;{\text{μm}}$. Backgrounds is the normalized intensity distribution. The transverse directions of rays are represented by red arrows, the length of arrow is proportional to the sine of the angle between the ray and the z axis. (f) Ray model of Airy beam. Different colors are used to distinguish the rays at different positions.

    图 3  不同横截面处Cusp光束的光线分布, 其中(a) $z = - 180\;{\text{μm}}$, (b) $z = - 100\;{\text{μm}}$, (c) $z = 0\;{\text{μm}}$, (d) $z = 100\;{\text{μm}}$, (e) $z = 180\;{\text{μm}}$; 背景色为归一化的光强分布; 灰色点为光线起点, 红色箭头为光线在xoy面投影矢量, 长度正比于光线与z轴的夹角大小; (f) Cusp光束的光线模型; 不同的颜色用以区分不同位置的光线

    Fig. 3.  Ray model of Cusp beam at (a) $z = - 180\;{\text{μm}}$, (b) $z = - 100\;{\text{μm}}$, (c) $z = 0\;{\text{μm}}$, (d) $z = 100\;{\text{μm}}$, and (e) $z = 180\;{\text{μm}}$. Backgrounds is the normalized intensity distribution. The transverse directions of rays are represented by red arrows, the length of arrow is proportional to the sine of the angle between the ray and the z axis. (f) Ray model of Cusp beam. Different colors are used to distinguish the rays at different positions.

    图 4  光锥模型及其焦面的傅里叶角谱 (a)经过物镜聚焦后的平行光的光线追踪示意图; (b)使用光线重构得到的焦面上光场的傅里叶角谱

    Fig. 4.  Ray-cone and its Fourier angular spectrum: (a) Ray tracing model of convergent parallel rays; (b) reconstructed Fourier angular spectrum according to the ray model.

    图 5  一维聚焦光束的高维光线模型 (a)聚焦光束的三维光线模型; (b)三维光线模型在xoz平面内的投影; (c)三维光线模型在poz平面内的投影

    Fig. 5.  High-dimensional ray model of convergent beam: (a) 3D ray model of convergent beam; (b) projection of 3D ray model in xoz plane; (c) projection of 3D ray model in poz plane.

    图 6  二维Airy光束的高维光线模型 (a) Airy光束的三维光线模型; (b)三维光线模型在xoz平面内的投影; (c)三维光线模型在poz平面内的投影

    Fig. 6.  High-dimensional ray model of (1 + 1)D Airy beam: (a) 3D ray model of (1 + 1)D Airy beam; (b) projection of 3D ray model in xoz plane; (c) projection of 3D ray model in poz plane.

    图 7  二维抛物线型波导中的厄米-高斯光束的高维光线模型 (a)三维光线模型; (b)三维光线模型在xoz平面内的投影; (c)三维光线模型在poz平面内的投影

    Fig. 7.  High-dimensional ray model of Hermit-Gaussian beam in quadratic gradient-index waveguide: (a) 3D ray model; (b) projection of 3D ray model in xoz plane; (c) projection of 3D ray model in poz plane.

  • [1]

    萧泽新, 安连生 2014 工程光学设计 (北京: 电子工业出版社) 第4−7页

    Xiao Z X, An L S 2014 Engineering Optical Design (Beijing: Publishing House of Electronics Industry) (in Chinese) pp4−7

    [2]

    Wikipedia contributor, " Ray tracing (graphics)” from Wikipedia—The Free Encyclopedia. https://en.wikipedia.org/w/index.php?title=Ray_tracing_(graphics)&oldid=888247514 [2019-5-27]

    [3]

    Zhang Z, Levoy M 2009 IEEE International Conferenceon the Computational Photography San Francisco, CA, USA April 16−17, 2009 pp1−10

    [4]

    张春萍, 王庆 2016 中国激光 43 0609004

    Zhang C P, Wang Q 2016 Chin. J. Lasers 43 0609004

    [5]

    Goodman J W 1968 Introduction to Fourier Optics (New York: McGraw-Hill)

    [6]

    玻恩 M, 沃耳夫 E 著 (杨薛荪 译) 2005 光学原理 (北京: 电子工业出版社) 第403页

    Born M, Wolf E (translated by Yang X S) 2005 Principle of Optics (Beijing: Publishing House of Electronics Industry) p 403 (in Chinese)

    [7]

    McNamara D A, Pistorius C W I, Malherbe J A G 1990 Introduction to the Uniform Geometrical Theory of Diffraction (London: Artech House) pp17−27

    [8]

    Keller J B 1962 J. Opt. Soc. Am. 52 116Google Scholar

    [9]

    Kaganovsky Y, Heyman E 2010 Opt. Express 18 8440

    [10]

    马亮, 吴逢铁, 黄启禄 2010 光学学报 30 2417

    Ma L, Wu F T, Huang Q L 2010 Acta Opt. Sin. 30 2417

    [11]

    Alonso M A, Dennis M R 2017 Optica 4 476Google Scholar

    [12]

    Bouchard F, Harris J, Mand H, Boyd R W, Karimi E 2016 Optica 3 351Google Scholar

    [13]

    左超, 陈钱, 孙佳嵩, Asundi A 2016 中国激光 43 0609002

    Zuo C, Chen Q, Sun J S, Asundi A 2016 Chin. J. Lasers 43 0609002

    [14]

    吕乃光, 金国藩, 苏显渝 2016 傅立叶光学 (北京: 机械工业出版社) 第73页

    Lü N G, Jin G P, Su X Y 2016 Fourier Optics (Beijing: China Machine Press) p73 (in Chinese)

    [15]

    Wolf E 1959 Proc. R. Soc. Lond. A 253 349Google Scholar

    [16]

    Siviloglou G A, Christodoulides D N 2007 Opt. Lett. 32 979Google Scholar

    [17]

    Barwick S 2010 Opt. Lett. 35 4118

    [18]

    Gong L, Liu W W, Ren Y X, Lu Y, Li Y M 2015 Appl. Phys. Lett. 107 231110Google Scholar

    [19]

    Forbes G W, Alonso M A 1998 Proc. SPIE 3482 22

    [20]

    Berry M V, Balazs N L 1979 Am. J. Phys. 47 264Google Scholar

    [21]

    Alonso M A, Forbes G W 2002 Opt. Express 10 728Google Scholar

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出版历程
  • 收稿日期:  2019-05-29
  • 修回日期:  2019-08-09
  • 上网日期:  2019-11-01
  • 刊出日期:  2019-11-05

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