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Dynamic-Metasurface-Based Cavity Structures for Enhanced Absorption and Phase Modulation
ACS Photonics ( IF 6.5 ) Pub Date : 2018-12-04 00:00:00 , DOI: 10.1021/acsphotonics.8b01014
M. Tayyab Nouman 1 , Jihyun Hwang 1 , Mohd. Faiyaz 2 , Gyejung Lee 1 , Do-Young Noh 2 , Jae-Hyung Jang
ACS Photonics ( IF 6.5 ) Pub Date : 2018-12-04 00:00:00 , DOI: 10.1021/acsphotonics.8b01014
M. Tayyab Nouman 1 , Jihyun Hwang 1 , Mohd. Faiyaz 2 , Gyejung Lee 1 , Do-Young Noh 2 , Jae-Hyung Jang
Affiliation
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Metasurface-based optical cavity structures consist of a metallic metasurface realized on top of a dielectric slab backed with a metal plane. Such structures have been employed in the design of optical devices such as flat lenses, wave plates, and holograms at frequencies from microwave to mid-infrared. Recently, such structures with dynamically reconfigurable optical characteristics have been explored for electrically tunable optical absorption and reflection phase modulation. To date, absorption modulation and phase modulation have been realized with large insertion loss. In this work, we employ an analytical approach based on transmission line theory where the metasurface is represented by a surface admittance. We extend the above approach for the design and analysis of under- and overcoupled resonance regimes in the metasurface cavity structure. This enables a mutual design of cavity thickness and individual metasurface for large amplitude or phase modulation. A dynamic-metasurface-based optical cavity is experimentally demonstrated at terahertz frequencies where the dynamic metasurface consists of metallic resonators embedded with thin-film vanadium dioxide patches. By driving an insulator to metal transition in vanadium dioxide, the terahertz optical response of the metasurface-based cavity structure is modulated. The fabricated device exhibits perfect absorption modulation and reflection phase modulation up to 180°. The reported results demonstrate the potential of such structures for realizing novel devices such as tunable holograms, high-efficiency modulators, and frequency-tunable filters at terahertz. The analytical approach presented here can be applied to the analysis and design of metasurface cavity structures based on other material systems at frequencies ranging from terahertz to mid-infrared.
中文翻译:
基于动态基于地表的腔结构,可增强吸收和相位调制
基于超表面的光腔结构由金属超表面组成,该金属超表面在带有金属平面的电介质平板顶部实现。在从微波到中红外的频率的光学装置例如平板透镜,波片和全息图的设计中已经采用了这样的结构。近来,已经探索了具有动态可重构光学特性的这种结构以用于电可调光吸收和反射相位调制。迄今为止,已经实现了具有大插入损耗的吸收调制和相位调制。在这项工作中,我们采用基于传输线理论的分析方法,其中超表面由表面导纳表示。我们扩展了上述方法,用于设计和分析超表面腔结构中的欠耦合和过耦合共振状态。这样就可以对腔体厚度和各个超颖表面进行相互设计,以实现大幅度或相位调制。在太赫兹频率上通过实验证明了基于动态金属表面的光学腔,其中动态金属表面由嵌入有薄膜二氧化钒贴片的金属谐振器组成。通过驱动绝缘子在二氧化钒中过渡到金属,对基于超表面的腔结构的太赫兹光学响应进行了调制。所制造的器件在高达180°的范围内展现出完美的吸收调制和反射相位调制。报道的结果证明了这种结构在实现新型设备(如可调全息图,太赫兹的高效调制器和频率可调滤波器。本文介绍的分析方法可用于基于其他材料系统的太赫兹至中红外频率的超表面腔结构的分析和设计。
更新日期:2018-12-04
中文翻译:
![](https://scdn.x-mol.com/jcss/images/paperTranslation.png)
基于动态基于地表的腔结构,可增强吸收和相位调制
基于超表面的光腔结构由金属超表面组成,该金属超表面在带有金属平面的电介质平板顶部实现。在从微波到中红外的频率的光学装置例如平板透镜,波片和全息图的设计中已经采用了这样的结构。近来,已经探索了具有动态可重构光学特性的这种结构以用于电可调光吸收和反射相位调制。迄今为止,已经实现了具有大插入损耗的吸收调制和相位调制。在这项工作中,我们采用基于传输线理论的分析方法,其中超表面由表面导纳表示。我们扩展了上述方法,用于设计和分析超表面腔结构中的欠耦合和过耦合共振状态。这样就可以对腔体厚度和各个超颖表面进行相互设计,以实现大幅度或相位调制。在太赫兹频率上通过实验证明了基于动态金属表面的光学腔,其中动态金属表面由嵌入有薄膜二氧化钒贴片的金属谐振器组成。通过驱动绝缘子在二氧化钒中过渡到金属,对基于超表面的腔结构的太赫兹光学响应进行了调制。所制造的器件在高达180°的范围内展现出完美的吸收调制和反射相位调制。报道的结果证明了这种结构在实现新型设备(如可调全息图,太赫兹的高效调制器和频率可调滤波器。本文介绍的分析方法可用于基于其他材料系统的太赫兹至中红外频率的超表面腔结构的分析和设计。