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可开关的多功能超构表面波片特性研究

刘东明 吕婷婷 刘强 刘超 史金辉

刘东明, 吕婷婷, 刘强, 刘超, 史金辉. 可开关的多功能超构表面波片特性研究[J]. 中国光学, 2021, 14(4): 1029-1037. doi: 10.37188/CO.2021-0100
引用本文: 刘东明, 吕婷婷, 刘强, 刘超, 史金辉. 可开关的多功能超构表面波片特性研究[J]. 中国光学, 2021, 14(4): 1029-1037. doi: 10.37188/CO.2021-0100
LIU Dong-ming, LV Ting-ting, LIU Qiang, LIU Chao, SHI Jin-hui. Performance study on switchable and multifunctional metasurface wave plate[J]. Chinese Optics, 2021, 14(4): 1029-1037. doi: 10.37188/CO.2021-0100
Citation: LIU Dong-ming, LV Ting-ting, LIU Qiang, LIU Chao, SHI Jin-hui. Performance study on switchable and multifunctional metasurface wave plate[J]. Chinese Optics, 2021, 14(4): 1029-1037. doi: 10.37188/CO.2021-0100

可开关的多功能超构表面波片特性研究

doi: 10.37188/CO.2021-0100
基金项目: 国家自然科学基金项目(No. U1931121);黑龙江省自然基金重点项目(No. ZD2020F002,No. ZD2018015)
详细信息
    作者简介:

    刘东明(1981—),男,黑龙江五常人,硕士,讲师,2011年于哈尔滨工程大学获得硕士学位,主要从事微纳结构光学器件设计。E-mail:ldm210@163.com

    吕婷婷(1989—),女,黑龙江汤原人,硕士,讲师,2014年于哈尔滨工程大学获得硕士学位,主要从事可调谐超构材料的结构设计与应用研究。E-mail:oktingting521@126.com

    刘 强(1980—),男,黑龙江泰来人,博士,教授,2012年于哈尔滨工程大学获得博士学位,主要从事光纤传感技术的研究。E-mail:nepulq@126.com

    刘 超(1978—),男,黑龙江木兰人,博士,教授,博士生导师,2008年于哈尔滨工业大学获得博士学位,主要从事微结构光学器件研究。E-mail:msm-liu@126.com

    史金辉(1979—),男,黑龙江肇东人,博士,教授,博士生导师,2007年于哈尔滨工程大学获得博士学位,主要从事超构材料的应用研究。E-mail:shijinhui@hrbeu.edu.cn

  • 中图分类号: TP394.1; TH691.9

Performance study on switchable and multifunctional metasurface wave plate

Funds: Supported by National Natural Science Foundation of China (No. U1931121); Natural Science Foundation of Heilongjiang Province in China (No. ZD2020F002, No. ZD2018015)
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  • 摘要: 宽频带和动态可调谐的超构表面在太赫兹无线通信、传感和医学成像等应用中具有重要的价值。结合VO2薄膜的相变原理,本文设计了一种单层“台阶型”复合超构表面,能够实现宽频带四分之一波片和半波片之间的灵活开关功能。VO2薄膜为常温绝缘相时,超构表面可视为透射型双偏振的宽频带四分之一波片。在1.43~2.43 THz宽频带范围内,能够将垂直入射的x偏振光转换成左旋圆偏振光,椭圆率大于0.99,相对带宽为52%。VO2薄膜为高温金属相时,超构表面能够实现反射型半波片功能,垂直入射的x偏振光能够转换成y偏振光。此外,本文也详细地研究了波片性能随倾斜入射角度的变化情况,结果表明,随着入射角度的增加,四分之一波片能够实现宽频带和双频带的动态切换,半波片可以实现频率可调谐度为57%的频移。本文所提出的单层“台阶型”复合超构表面有望促进宽频带偏振转换器件,可调谐开关和紧凑型光学器件的发展。
  • 图  1  基于相变原理的单层“台阶型”复合超构表面的工作原理和结构示意图。(a)VO2为绝缘相时,超构表面具有透射型四分之一波片功能;(b)VO2为金属相时,超构表面具有反射型半波片功能;(c)复合超构表面基本单元的结构参数图。

    Figure  1.  Schematics of structure and working principle of single-layered “stepped” hybrid metasurface based on VO2 phase transition. (a) The hybrid metasurface can act as a transmission-type quarter-wave plate when VO2 is in an insulating phase. (b) The hybrid metasurface is a reflection-type half-wave plate when VO2 is in a metallic phase. (c) Stereogram of a unit cell in the proposed metasurface.

    图  2  常温下单层“台阶型”复合超构表面的透射偏振特性。(a)和(d)透射系数;(b)和(e)相位差;(c)和(f)归一化椭圆率和透射圆偏振光的能量。黄色区域带宽为1 THz,绿色区域带宽为0.22 THz。

    Figure  2.  Polarization performance of single-layered “stepped” hybrid metasurface when VO2 film is insulating phase. (a) and (d) Transmission coefficient; (b) and (e) phase difference between y- and x-polarized transmitted light; (c) and (f) calculated intensity S0 and ellipticity χ. The yellow area indicates the bandwidth of 1 THz, and the green area indicates the bandwidth of 0.22 THz.

    图  3  平行于x轴方向线栅的(a)透射特性和(b)相位差。平行于y轴方向线栅的(c)透射特性和(d)相位差。

    Figure  3.  (a) Simulated transmission and (b) phase difference of the wire metasurface parallelled to the x-axis direction. (c) Simulated transmission and (d) phase difference of the wire metasurface parallelled to y-axis direction

    图  4  温度为87°C时(x偏振光垂直入射),超构表面的反射特性和表面电流分布。(a)反射系数和偏振转换率;(b)和(c)“台阶型”金属谐振器和VO2薄膜在2.80 THz处的表面电流分布

    Figure  4.  At 87°C, reflection performance and surface current distribution of the hybrid metasurface under x-polarized light normal incidence. (a) Reflection coefficient and polarization conversion ratio. (b) and (c) Surface current distribution of "stepped" metal resonator and VO2 film at 2.80 THz

    图  5  VO2相变过程中四分之一波片和半波片输出光偏振态的变化情况。(a)垂直入射x偏振光和(b)y偏振光激发超构表面产生的透射偏振态。(c)垂直入射x偏振光激发超构表面产生的反射偏振态

    Figure  5.  Polarization ellipse of the output wave with VO2 conductivity ranging from 10 S/m to 200000 S/m. Polarization ellipse of the transmitted wave (a) at 2.20 THz for x-polarized and (b) at 2.95 THz for y-polarized normal illumination of the hybrid metasurface. (c) Polarization ellipse of the reflected wave at 2.80 THz for x-polarized normal illumination of the hybrid metasurface

    图  6  四分之一波片性能随入射角度的变化关系。(a)和(c)χ;(b)和(d)S0

    Figure  6.  Quarter-wave plate performance as a function of oblique incident angle. (a) and (c) ellipticity χ. (b) and (d) intensity S0

    图  7  半波片性能随入射角度的变化关系(a)ryx;(b)PCR

    Figure  7.  Half-wave plate performance as a function of oblique incident angle. (a) ryx; (b) PCR

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  • 收稿日期:  2021-05-03
  • 修回日期:  2021-05-24
  • 网络出版日期:  2021-06-11
  • 刊出日期:  2021-07-28

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