Reconfigurable optoelectronic absorber based on nested nano disk-ribbon graphene Pattern in THz range

Memories - Materials, Devices, Circuits and Systems Pub Date : 2023-07-01 DOI:10.1016/j.memori.2023.100039

Ilghar Rezaei , Ava Salmanpour , Toktam Aghaee

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引用次数: 5

Abstract

A two-layers, multi-band super absorber with the capability of being tuned is proposed in this paper. The idea behind the design is to realize periodic arrays of graphene disks via graphene ribbons with different lengths. Then circuit modeling is developed to be used alongside the impedance matching concept to achieve more than ten absorption peaks. The exploited spacer is a lossless polymer in the THz frequency range while the bottom of the device is occupied by a relatively thick golden plate. The developed circuit model description is verified by full-wave simulation. According to the simulation results, the proposed absorber shows more than ten peaks with absorption over 90%. The peak frequencies are interestingly able to be shifted via exploited single chemical potential variations. Additionally, deviations of absorber response against graphene electron relaxation time and device geometry are shown to be marginal which makes the presented meta-absorber, a reliable optical device.

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太赫兹范围内基于嵌套纳米盘带石墨烯图案的可重构光电子吸收器

本文提出了一种具有调谐能力的双层多频带超级吸收体。该设计背后的想法是通过不同长度的石墨烯带实现石墨烯盘的周期性阵列。然后，电路建模被开发为与阻抗匹配概念一起使用，以实现十多个吸收峰值。所开发的间隔物是太赫兹频率范围内的无损聚合物，而器件的底部被相对较厚的金片占据。通过全波仿真验证了所开发的电路模型描述。根据模拟结果，所提出的吸收体显示出十多个吸收率超过90%的峰。有趣的是，峰值频率能够通过利用的单个化学势变化来移动。此外，吸收体响应相对于石墨烯电子弛豫时间和器件几何形状的偏差被证明是边际的，这使得所提出的元吸收体成为一种可靠的光学器件。

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Memories - Materials, Devices, Circuits and Systems

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