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基于金属狭缝阵列的各向异性偏振分束器

马婧 刘冬冬 王继成 冯延

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基于金属狭缝阵列的各向异性偏振分束器

马婧, 刘冬冬, 王继成, 冯延

Anisotropic polarization beam splitter based on metal slit array

Ma Jing, Liu Dong-Dong, Wang Ji-Cheng, Feng Yan
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  • 在金属-电介质结构的基础上提出了一种基于金属狭缝阵列的各向异性偏振分束器,并采用有限元法研究了横磁(TM)和横电(TE)偏振光入射后结构所表现出的负反射和镜面反射等特性.计算结果表明,当偏振光的入射角设定在2070时,入射的TM光发生强烈的负反射,而TE光的负反射很弱,并随着波长的增加而急剧下降.分析可得偏振分束光栅的理想负反射点和反射面的完美对称响应效果.通过仿真得到了理想负反射点的取值范围.结合严格耦合波法软件,计算不同偏振光入射时负反射和镜面反射条件下的反射率,其消光比高达106.
    Polarizing beam splitter (PBS) can separate the propagating directions of two incident orthogonally polarized light beams. However, conventional PBS and multi-layered metamaterial structures are complicated and neither of them can meet the requirements for broadband characteristics due to their resonant characters. In this paper, an anisotropic beam splitter based on metal slit array of the metal-dielectric structure is proposed in order to simplify the structure and improve the beam splitting efficiency. Because of the transverse momentum generated by the inhomogeneous interface, the transverse magnetic (TM) wave is negatively reflected from the surface of the gold film after it has entered into the slit with the waveguide mode of the plasma. When the free electrons on the metal surface oscillate, the transverse electric (TE) wave parallel to the grating direction can cause electrons to oscillate along the grating direction, so that the TE light cannot enter into the slit, resulting in specular reflection. The finite element method is used to study the effects of TM and TE polarized light such as negative reflection (NR) and specular reflection (SR). The results show that when the incident angle of the polarized light is set to be in a range from 20 to 70, the incident TM light has a strong NR of about 0.9, but the TE light is weakly reflected and decreases sharply with the increase of the wavelength. The ideal NR points of the beam splitter and the perfect symmetrical response of the reflection surface are calculated, and the ideal NR point satisfies P=/(2sin 0). When the incident light angle changes, the variations of the wavelength of the negative and zero order reflection peak are different from those of TM and TE wave, which is more conducive to the tuning of the interaction between light and grating structure. The NR and SR spectral reflectance of different polarized light beams are calculated by rigorous coupled-wave analysis, and the extinction ratios in the two cases are both 106. In addition, those designs of plasmonic splitters will pave the way for the practical applications of plasmonic devices in data storages and optical holography.
      通信作者: 王继成, jcwang@jiangnan.edu.cn
    • 基金项目: 国家自然科学基金(批准号:11504139)、江苏省自然科学基金(批准号:BK20140167)、国家博士后基金(批准号:2017M611693)、江苏省高校自然科学基金(批准号:16KJB140016)和毫米波国家重点实验室开放课题(批准号:K201802)资助的课题.
      Corresponding author: Wang Ji-Cheng, jcwang@jiangnan.edu.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11504139), the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20140167), the National Postdoctoral Science Foundation of China (Grant No. 2017M611693), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 16KJB140016), and the Open Fund of State Key Laboratory of Millimeter Waves, China (Grant No. K201802).
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    [12]

    Luo D, Sun X W, Dai H T, Demir H V 2011 Appl. Opt. 50 2316

    [13]

    Wang Y P, Wang M P, Huang X Q 2011 Opt. Express 19 25535

    [14]

    Nguyen H N, Lo Y L, Chen Y B, Yang T Y 2011 Appl. Opt. 50 415

    [15]

    Wu Y R, Hollowell A E, Zhang C, Guo L J 2013 Sci. Rep. 3 1194

    [16]

    Chen X, Yang F, Zhang C, Zhou J, Guo L J 2016 ACS Nano 10 4039

    [17]

    Zheng J, Ye Z C, Sheng Z M, Zhang J 2015 11th Conference onLasers and Electro-Optics Pacific Rim Busan, South Korea, August 24-28, 2015 p1

    [18]

    Ye Z C, Zheng J, Sun S, Guo L D, Shieh H P D 2013 IEEE J. Sel. Top. Quant. 19 4800205

    [19]

    Ni X J, Emani N K, Kildishev A V, Boltasseva A, Shalaev V M 2012 Science 335 427

    [20]

    Ordal M A, Long L L, Bell R J, Bell S E, Bell R R, Alexander R W J, Ward C A 1983 Appl. Opt. 22 1099

    [21]

    Liu M L, Liu R J, Deng X B, Wang Y W, Lei H N 2010 Acta Phys. Sin. 59 4030 (in Chinese) [刘明礼, 刘仁杰, 邓晓斌, 王亚伟, 雷海娜 2010 物理学报 59 4030]

    [22]

    Pors A, Albrektsen O, Radko I P, Bozhevolnyi S I 2013 Sci. Rep. 3 2155

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    Deng Z L, Zhang S, Wang G P 2016 Nanoscale 8 1588

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    Deng Z L, Li X, Wang G P 2017 arXiv:170510171 [physics.optics]

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出版历程
  • 收稿日期:  2017-10-24
  • 修回日期:  2018-01-05
  • 刊出日期:  2018-05-05

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