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基于Metasurface的轨道角动量光束的产生与调控

Generating and Modulating Orbital Angular Momentum Beams by Metasurface

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摘要

提出了一种基于metasurface产生与调控轨道角动量光束的新方法。光场在偏振态的演变过程中可以获得附加的Pancharatnam-Berry(PB)几何相位。因此,可以通过调控光场的偏振态获得所需相位。所构造的metasurface具有空间变化的光轴分布,能够精确地操控光束的偏振态。当metasurface 的光轴方向在方位角方向连续变化时,就能产生与方位角坐标相关的PB 相,也就是涡旋相。该相位可以用来产生轨道角动量光束,也可以用来操控涡旋光束的轨道角动量。实验结果验证了这种方案的可行性。所得到的结果为轨道角动量光束的产生及光束的轨道角动量调控提供了一种新方法,对基于轨道角动量光束的量子通信和光学微操控等也有应用价值。

Abstract

A new approach is proposed to enable a beam to carry orbital angular momentum (OAM) and manipulate the OAM of vortex beams by using metasurface. In the evolution of the polarization state, the light field can acquire a Pancharatnam-Berry(PB) geometric phase. Then it is possible to obtatin a desired phase by manipulating the polarization of light. The metasurface constructed in this paper has a distribution of spatially varying optical axes, and can manipulate the polarization of light accurately. Particularly, if the optical axis orientation of metasurface changes continuously along the azimuth direction, an azimuth-dependent PB phase, i.e. a vortex phase, will be imparted to the beam. Such a phase can be used to enable a beam to carry OAM and tune the OAM of a vortex beam. Further experiments verify the theoretical results. The results provide a new way to generate OAM beams and modulate their OAM, which is expected to have potential applications in quantum communication and optical micromanipulation.

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中图分类号:O436

DOI:10.3788/aos201535.0826002

所属栏目:物理光学

基金项目:国家自然科学基金(10904036)、湖南省自然科学基金(2015JJ3036)

收稿日期:2015-04-10

修改稿日期:2015-04-27

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贺时梅:湖南大学信息科学与工程学院微纳光电器件及应用教育部重点实验室, 湖南 长沙 410082
舒维星:湖南大学信息科学与工程学院微纳光电器件及应用教育部重点实验室, 湖南 长沙 410082

联系人作者:贺时梅(heshimeislz@163.com)

备注:贺时梅(1989—),女,硕士研究生,主要从事光子自旋霍尔效应方面的研究。

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引用该论文

He Shimei,Shu Weixing. Generating and Modulating Orbital Angular Momentum Beams by Metasurface[J]. Acta Optica Sinica, 2015, 35(8): 0826002

贺时梅,舒维星. 基于Metasurface的轨道角动量光束的产生与调控[J]. 光学学报, 2015, 35(8): 0826002

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