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A switchable polarization-independent THz absorber using a phase change material

机译：使用相变材料的可切换的偏振无关太赫兹吸收器

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摘要

In this paper, we propose a tunable polarization-insensitive multi-frequency and broadband absorber (TMBA) based on a phase change material, which is vanadium dioxide (VO2). Compared with the prior works, the operation state of such a TMBA can be regulated by the temperature. When the temperature is 350 K, the proposed TMBA can act as an broadband absorber, whose absorption region (absorption is over 90%) runs from 10.04 to 16.22 THz at normal incidence. When the temperature is 300 K and the incident angle is normal, such a TMBA can work as a multi-frequency absorber that has five absorption frequency points exceeding 90%, which are situated at 6.11 THz, 9.51 THz, 12.81 THz, 16.07 THz and 17.55 THz, respectively. To figure out the physical mechanism, the electric field, the surface current and the power loss density of the TMBA are presented, and effect of incident angle and structural parameters on the performance of this TMBA also is given. The results show that, with the incident angle increasing, the absorption of this TMBA is reduced. Such a TMBA can be used as a solar energy harvesting.
机译：在本文中，我们提出了一种基于相变材料的可调谐偏振不敏感多频和宽带吸收器（TMBA），即二氧化钒（VO2）。与现有技术相比，这种TMBA的工作状态可以通过温度来调节。当温度为350 K时，建议的TMBA可以充当宽带吸收器，其吸收区域（吸收率超过90％）在法向入射时的频率为10.04 THz至16.22 THz。当温度为300 K且入射角正常时，这样的TMBA可以用作多频吸收器，其五个吸收频率点超过90％，分别位于6.11 THz，9.51 THz，12.81 THz，16.07 THz和分别为17.55 THz。为了弄清楚TMBA的物理机理，提出了电场，表面电流和功率损耗密度，并给出了入射角和结构参数对TMBA性能的影响。结果表明，随着入射角的增加，该TMBA的吸收率降低。这样的TMBA可以用作太阳能收集。

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  • 来源
    《Optical and quantum electronics》 |2019年第9期|306.1-306.12|共12页
  • 作者

    Kong Xin-Ru; Zhang Hai-Feng; Dao Ri-Na;

  • 作者单位

    Nanjing Univ Posts & Telecommun Coll Elect & Opt Engn Nanjing 210023 Jiangsu Peoples R China|Nanjing Univ Posts & Telecommun Coll Microelect Nanjing 210023 Jiangsu Peoples R China;

    Nanjing Univ Posts & Telecommun Coll Elect & Opt Engn Nanjing 210023 Jiangsu Peoples R China|Nanjing Univ Posts & Telecommun Coll Microelect Nanjing 210023 Jiangsu Peoples R China|Southeast Univ State Key Lab Millimeter Waves Nanjing 210096 Jiangsu Peoples R China|Kent State Univ Liquid Crystal Inst Kent OH 44242 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Tunable absorber; Polarization-insensitive absorber; Phase change material; Broadband;

    机译：可调吸收器;偏振不敏感吸收体;相变材料;宽频;

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