光子学报 ›› 2019, Vol. 48 ›› Issue (3): 326002-0326002.doi: 10.3788/gzxb20194803.0326002

• 物理光学 • 上一篇    下一篇

对称艾里涡旋光束的传播特性

毛红行1, 兰燕平1, 赖松陶1, 钱义先1,2   

  1. 1. 浙江师范大学 浙江省光信息检测与显示重点实验室, 浙江 金华 321004;
    2. 桂林电子科技大学 广西自动检测技术与仪器重点实验室, 广西 桂林 541004
  • 收稿日期:2018-11-01 出版日期:2019-03-25 发布日期:2019-03-25
  • 通讯作者: 钱义先(1974-),男,副教授,博士,主要研究方向为新颖光场理论及光场调控技术.Email:qianyixian@zjnu.edu.cn
  • 作者简介:毛红行(1993-),女,硕士研究生,主要研究方向为自加速光束的传播.Email:maohongxing_edu@163.com
  • 基金资助:

    国家自然科学基金(No.61377014),浙江省自然科学基金(No.LY17A040002),广西自动检测技术与仪器重点实验室基金

Propagation Characteristic of Symmetric Airy Vortex Beams

MAO Hong-xing1, LAN Yan-ping1, LAI Song-tao1, QIAN Yi-xian1,2   

  1. 1. Key Laboratory of Optical Information Detecting and Display Technology in Zhejiang Province, Zhejiang Normal University, Jinhua, Zhejiang 321004, China;
    2. Guangxi Key Laboratory of Automatic Detection Technology and Instrument, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China
  • Received:2018-11-01 Online:2019-03-25 Published:2019-03-25
  • Supported by:

    The National Natural Science Found of China (No.61377014), Natural Science Found of Zhejiang Province (No.LY17A040002), Guangxi Key Laboratory of Automatic Detecting Technology and Instruments

摘要:

提出了一种对称艾里涡旋光束.在对称立方相位的基础上引入螺旋相位因子形成新的相位图,加载该相位的高斯光束经傅里叶变换后产生对称艾里涡旋光束.研究表明:对称艾里涡旋光束出现自聚焦现象,且由于轴上涡旋的存在,其中心呈现中空现象,涡旋结构携带的轨道角动量使光束在初始平面处发生旋转,拓扑荷数越大,中空结构越大,旋转角度也越大,而拓扑荷数的正负仅改变光束的旋向.理论分析表明,离轴涡旋在初始平面处,因与光轴中心距离较远,并不会影响对称艾里光束主瓣的能量,即中心并无光强为零区域,但随着传播距离的增加,离轴涡旋逐渐出现在对称艾里光束其中的一个主瓣上.此外,对称艾里光束还可以加载多个离轴涡旋,能同时无损伤地捕获多个微粒.该光束不仅具有自聚焦特性,并且其中心呈中空结构,同时还携带轨道角动量,在光学微操纵与生物医学等方面有潜在应用.

关键词: 对称艾里涡旋光束, 轨道角动量, 相位调制, 自聚焦

Abstract:

A symmetric Airy vortex beam can be generated by modulating a Gaussian beam imposed on an improved phase pattern, where helical phase factor is introduced in symmetric cubic phase. The experimental results and numerical simulations demonstrate that such beams possess autofocusing characteristic and have a dark core owing to on-axis vortex. Such a special structure causes the beams to rotate in the initial plane. The lager topological charge, the bigger dark area, the greater rotating angle. The positive or negative topological charge only changes the rotating direction. Theoretical analysis shows that in the initial plane, the main lobe of symmetric Airy beams and off-axis vortex have nearly no influence. However, off-axis vortex will gradually appear on one of the main lobes of the symmetric Airy beams during propagation. In addition, the symmetric Airy beams also can embed multiple off-axis vortices which can capture multiple particles without damage. Due to the above characteristics, the beams have potential applications in optical trapping and biomedicine.

Key words: Orbital angular momentum, Symmetric Airy vortex beams, Autofocusing, Phase modulation

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