基于石墨烯Salisbury屏幕混合超表面的电可调式完美太赫兹吸收器,Advanced Optical Materials

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基于石墨烯Salisbury屏幕混合超表面的电可调式完美太赫兹吸收器
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-07-10 , DOI: 10.1002/adom.201900660
Xieyu Chen ₁ , Zhen Tian ₁ , Yongchang Lu ₁ , Yuehong Xu ₁ , Xueqian Zhang ₁ , Chunmei Ouyang ₁ , Jianqiang Gu ₁ , Jiaguang Han ₁ , Weili Zhang _{1,

2}

Affiliation

石墨烯作为一种流行的2D半导体，其载流子浓度可通过外部偏压（例如电偏压和光激发）广泛地定制，是有源光电技术的有希望的候选者。通过将金属光栅集成到经典的石墨烯Salisbury屏幕中，提出了一种电可调的完美太赫兹吸收器。测量表明，即使是轻掺杂的石墨烯也可以实现完美的吸收，调制深度可达到25％。开发了基于传输线理论的数值模拟和分析模型来验证设计，与测量结果显示出良好的一致性。另外，还实验性地探索了太赫兹响应对物理尺寸和入射太赫兹场的极化的依赖性。这表明混合太赫兹器件能够用作消光比高达23 dB的可调完美吸收体或可调偏振器。这些结果证明了使用低载流子迁移化学气相沉积（CVD）生长的石墨烯进行可调的完美太赫兹吸收的可行性，该太赫兹吸收适用于潜在应用，例如太赫兹切换以及时域和空间域调制。

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Electrically Tunable Perfect Terahertz Absorber Based on a Graphene Salisbury Screen Hybrid Metasurface

Graphene, as a popular 2D semiconductor, with a carrier concentration that can be extensively tailored by external stimulants, such as electric bias and photoexcitation, is a promising candidate for active optoelectronics. An electrically tunable perfect terahertz absorber is presented by integrating a metallic grating into classical graphene Salisbury screen. The measurement shows that perfect absorption can be achieved for even lightly‐doped graphene and a modulation depth up to 25% is realized. Numerical simulation and analytical model based on the transmission line theory are developed to validate the design, showing a good agreement with the measured results. In addition, dependence of the terahertz response on physical dimensions and polarization of the incident terahertz field is also experimentally explored. It indicates that the hybrid terahertz device is able to function as tunable perfect absorber or tunable polarizer with an extinction ratio up to 23 dB. These results demonstrate the feasibility of using low carrier mobility chemical vapor deposition (CVD) grown graphene for tunable perfect terahertz absorption, which is suitable for potential applications, such as terahertz switching, and time domain and spatial domain modulation.

更新日期：2020-02-07

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