Analysis of graphene-based tunable THz four-band absorption sensors

被引：18

作者：

Huang, Chengcheng ^{[1
]}

Zhang, Yonggang ^{[1
]}

Liang, Lanju ^{[2
]}

Yao, Haiyun ^{[2
]}

Qiu, Fu ^{[1
]}

Liu, Wenjia ^{[1
]}

机构：

[1] Anhui Univ Sci & Technol, Sch Elect & Informat Engn, Huainan 232001, Anhui, Peoples R China

[2] Zaozhuang Univ, Sch Optoelect Engn, Zaozhuang 277160, Peoples R China

来源：

APPLIED OPTICS | 2022年 / 61卷 / 08期

基金：

中国国家自然科学基金;

关键词：

PERFECT METAMATERIAL ABSORBER; REFRACTIVE-INDEX; PLASMONICS;

D O I：

10.1364/AO.447968

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A novel, to the best of our knowledge, four-band tunable absorber sensor, based on a graphene layer, is presented. The proposed sensor configuration is composed of a single monolayer of graphene placed on top of a SiO2 dielectric substrate, whereas a gold grounding plane is placed beneath the SiO2. In addition, the resonant frequencies of the sensor can be directly controlled by adjusting the Fermi level of graphene, while the absorption rate reaches a value greater than 99% at all resonant peaks. The acquired calculation results of the refractive index sensitivity of our proposed sensor show that the four resonant peaks possess superior sensing characteristics. Additionally, by covering the measured objects with different refractive indices, the acquired results indicate that the sensing performance of the sensor exhibits good linearity. From our analysis, it is concluded that the absorbing sensor exhibits a broad range of potential applications in the biomedical field. (C) 2022 Optica Publishing Group

引用

页码：2103 / 2107

页数：5

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