Active Control of Asymmetric Fano Resonances with Graphene–Silicon‐Integrated Terahertz Metamaterials,Advanced Materials Technologies

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Active Control of Asymmetric Fano Resonances with Graphene–Silicon‐Integrated Terahertz Metamaterials
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2020-01-08 , DOI: 10.1002/admt.201900840
Quan Li ₁ , Manoj Gupta ₂ , Xueqian Zhang ₃ , Shuang Wang ₁ , Tai Chen ₁ , Ranjan Singh ₂ , Jiaguang Han ₃ , Weili Zhang _{3,

4}

Affiliation

Planar metamaterials are extensively studied in recent years due to their potential applications in design of flat optical components, ultrasensitive sensors, lasing spasers, and nonlinear devices. Recent studies have reported dynamic control of photoactive material–based metamaterials through optical excitation. However, most of the previous demonstrations rely on single stimulus control and typically require large fluence and ultrafast pulses of light. Here, graphene is integrated with Fano resonant metasurface on silicon substrate that provides active modulation of terahertz waves with low‐power, continuous wave (CW) optical (λ = 532 nm) excitation. More importantly, the hybrid graphene–silicon system provides “dual control” through a combination of applied electrical bias voltage and photodoping of silicon by CW illumination which alters the conductivity of the graphene resulting in an active modulation of the metamaterial resonance. Large real‐time tunability with dual control characteristics of resonant metasurfaces can be a promising route for designing active and functional terahertz metadevices.

中文翻译：

石墨烯-硅集成太赫兹超材料的非对称fano共振的主动控制

近年来，由于平面超材料在平面光学组件，超灵敏传感器，激射器和非线性器件设计中的潜在应用，因此对其进行了广泛的研究。最近的研究报道了通过光激发动态控制基于光敏材料的超材料。但是，大多数先前的演示都依赖于单个刺激控制，并且通常需要大的通量和超快的光脉冲。此处，石墨烯与硅基板上的Fano谐振超表面集成在一起，可通过低功率连续波（CW）光学（λ= 532 nm）激发提供对太赫兹波的有源调制。更重要的是，混合石墨烯-硅系统通过施加的偏压和CW照射对硅进行光掺杂而提供了“双重控制”，从而改变了石墨烯的电导率，从而有效地调制了超材料的共振。具有共振超表面的双重控制特性的大型实时可调性可能是设计有源和功能太赫兹超颖器件的有前途的途径。

更新日期：2020-02-10

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