石墨烯可调谐双频完美吸收器设计

doi:10.13438/j.cnki.jdzk.2023.06.007

吉首大学学报（自然科学版） ›› 2023, Vol. 44 ›› Issue (6): 37-43.DOI: 10.13438/j.cnki.jdzk.2023.06.007

石墨烯可调谐双频完美吸收器设计

赵金云，单馨雨，高广波，黄勇刚

(吉首大学物理与机电工程学院，湖南吉首 416000)

出版日期:2023-11-25 发布日期:2023-12-19
通讯作者: 黄勇刚(1982—)，男，湖北武汉人，吉首大学物理与机电工程学院教授，博士，主要从事光学研究.E-mail:huang122012@163.com.
作者简介:赵金云(1995—)，女，贵州毕节人，吉首大学物理与机电工程学院硕士研究生，主要从事光学研究
基金资助:
国家自然科学基金资助项目(11964010,11464013,11464014)；湖南省自然科学基金资助项目(2020JJ4495)；湖南省教育厅重点项目(21A0333)；湖南省研究生创新项目(CX20221126)

Tunable Dual-Frequency Perfect Absorber with Graphene

ZHAO Jinyun,SHAN Xinyu,GAO Guangbo,HUANG Yonggang

(College of Physics and Electromechanical Engineering,Jishou University,Jishou 416000,Hunan China)

Online:2023-11-25 Published:2023-12-19

摘要/Abstract

摘要：利用石墨烯优异的可调光学特性，设计了一种由石墨烯谐振器、SiO₂介质层及金属反射层组成的可调谐双频完美吸收器，研究了石墨烯化学势、偏振角及尺寸大小对吸收器吸收性能的影响，并分析了共振频率处的电场模式，进一步解释吸收器的吸收原理.结果表明，吸收器在6.363 THz和8.987 THz处的吸收率分别为99.98%和99.99%；吸收峰位可通过改变石墨烯化学势进行有效调节，0°~80°范围内的任意偏振角下，峰值吸收率均可达90%以上；SiO₂介质层厚度对吸收器的共振峰位几乎没有影响，但对峰值吸收率有一定影响，随着厚度的逐渐增加，吸收率先升高后降低，在厚度为3.1 μm附近时实现完美吸收.以上结果说明，吸收器的高吸收率主要源于电磁共振作用.

关键词： 超材料, 太赫兹, 石墨烯, 双频窄带吸收器

Abstract: A tunable dual-frequency perfect absorber consisting of a graphene resonator,a SiO₂dielectric layer and a metal reflector layer has been designed by utilizing the excellent tunable optical properties of graphene.The effects of graphene chemical potential,polarization angle and size on the absorber absorption performance were systematically investigated,and the electric field pattern at the resonance frequency was analyzed to further explain the principle of absorber absorption.The results show that the absorber has an absorption rate of 99.98% and 99.99% at 6.363 and 8.987,respectively.The absorption peak position of the absorber can be effectively adjusted by changing the chemical potential of graphene,and the peak absorption rate can reach more than the peak absorption rate at any polarization angle in the range of 0°~80°.The thickness of the SiO₂ dielectric layer has almost no effect on the resonance peak position of this absorber,but it has some effect on the peak absorption rate,which increases and then decreases with the gradual increase of the thickness,and perfect absorption is achieved near the thickness of 3.1 μm.The high absorption rate of this absorber stems mainly from the electromagnetic resonance effect.

Key words: metamaterials, terahertz, graphene, dual-band absorber

赵金云, 单馨雨, 高广波, 黄勇刚. 石墨烯可调谐双频完美吸收器设计[J]. 吉首大学学报（自然科学版）, 2023, 44(6): 37-43.

ZHAO Jinyun, SHAN Xinyu, GAO Guangbo, HUANG Yonggang. Tunable Dual-Frequency Perfect Absorber with Graphene[J]. Journal of Jishou University(Natural Sciences Edition), 2023, 44(6): 37-43.

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石墨烯可调谐双频完美吸收器设计

Tunable Dual-Frequency Perfect Absorber with Graphene

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