Chinese Optics Letters, Volume. 20, Issue 12, 123601(2022)

High-efficiency monolayer metallic metasurface for modulation of orbital angular momentum

Peijun Liu, Yanan Fu, Xi Xie, Changjun Min*, Yuquan Zhang, and Xiaocong Yuan**
Author Affiliations
  • Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology & Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
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    The optical vortex beam has widely been studied and used because of its unique orbital angular momentum (OAM). To generate and control OAM in compact and integrated systems, many metallic metasurface devices have been proposed, however, most of them suffer from the low efficiency. Here, we propose and experimentally verify a high-efficiency monolayer metallic metasurface composed of semicircular nano-grooves distributed with detour phase. The metasurface can generate single or an array of OAM with spin-sensitive modulation and achieve the maximum efficiency of 60.2% in theory and 30.44% in experiment. This work has great potential in compact OAM detection and communication systems.

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    1. Introduction

    A vortex is a universal phenomenon in nature, and it also exists in light that is referred to as an optical vortex (OV)[1]. The OV was found to have a helical wavefront around a phase singularity and carry orbital angular momentum (OAM) during propagation[2]. Generally, OAM can exist in a variety of light beams such as the Laguerre–Gaussian beam[3], Bessel beam[4], and perfect vortex beam[5]. In theory, the topological charge of OAM can be arbitrary integers, and OV beams with different OAM are orthogonal to each other. Therefore, the OAM of OV beams can be regarded as a new degree of freedom and has great application prospects, especially in optical communication[6,7]. In addition, because of its unique characteristics in intensity and phase distributions, OV beams have been widely used in optical tweezers[8], nonlinear optics[9], optical imaging[10], and other fields.

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    Peijun Liu, Yanan Fu, Xi Xie, Changjun Min, Yuquan Zhang, Xiaocong Yuan. High-efficiency monolayer metallic metasurface for modulation of orbital angular momentum[J]. Chinese Optics Letters, 2022, 20(12): 123601

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    Paper Information

    Category: Nanophotonics, Metamaterials, and Plasmonics

    Received: Mar. 3, 2022

    Accepted: Jun. 17, 2022

    Posted: Jun. 17, 2022

    Published Online: Jul. 13, 2022

    The Author Email: Changjun Min (cjmin@szu.edu.cn), Xiaocong Yuan (xcyuan@szu.edu.cn)

    DOI:10.3788/COL202220.123601

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