TY - JOUR
T1 - A Broadband Switchable Metamaterial Absorber/Reflector Based on Multi-Laps Graphene Sheets in the Terahertz Band
AU - Du, Xuemei
AU - Yan, Fengping
AU - Wang, Wei
AU - Zhang, Luna
AU - Bai, Zhuoya
AU - Zhou, Hong
AU - Hou, Yafei
N1 - Funding Information:
Manuscript received August 5, 2021; revised August 25, 2021; accepted August 27, 2021. Date of publication September 1, 2021; date of current version September 14, 2021. This work was supported in part by the National Natural Science Foundation of China under Grants 61620106014 and 61827818. (Corresponding author: Fengping Yan.) Xuemei Du, Fengping Yan, Wei Wang, Luna Zhang, and Zhuoya Bai are with the Key Laboratory of All Optical Network and Advanced Telecommunication of Electromagnetic Compatibility, Institute of Light-wave Technology, Beijing Jiaotong University, Beijing 100044, China (e-mail: 18111011@bjtu.edu.cn; fpyan@bjtu.edu.cn; 15111006@bjtu.edu.cn; 15111007@bjtu.edu.cn; 16111003@bjtu.edu.cn).
Publisher Copyright:
© 2009-2012 IEEE.
PY - 2021/10
Y1 - 2021/10
N2 - Switchable metamaterial absorbers/reflectors (MAs/MRs) are important bifunctional electromagnetic devices and have been the subject of numerous scientific studies. However, there is a lack of bifunctional devices that operate in the terahertz band. Here, we theoretically propose a broadband switchable MA with many excellent properties, such as good thermal stability, high insensitivity to inferior film quality of the graphene, excitation polarization and wide incident angles, and outstanding structural parameter tolerance. The bandwidth of the proposed broadband MA is 3.4 THz with an absorptivity over 90% in the frequency band of 1.6-5 THz. The proposed absorber can switch to a reflector with a reflectivity over 93% by tuning the chemical potential of the graphene and reducing the temperature. Therefore, the switching intensity of the proposed MA exceeds 83%. The physical mechanisms of the broadband absorption of the proposed structure are investigated using the impedance matching theory and the multiple reflection interference theory. The reflection mechanism of the proposed broadband reflector is discussed by analyzing the effective parameters. The absorption and switching mechanism are theoretically investigated by performing detailed numerical calculations to analyze the surface loss intensity, electric field, and magnetic field. These findings can accelerate the development of terahertz broadband switchable devices.
AB - Switchable metamaterial absorbers/reflectors (MAs/MRs) are important bifunctional electromagnetic devices and have been the subject of numerous scientific studies. However, there is a lack of bifunctional devices that operate in the terahertz band. Here, we theoretically propose a broadband switchable MA with many excellent properties, such as good thermal stability, high insensitivity to inferior film quality of the graphene, excitation polarization and wide incident angles, and outstanding structural parameter tolerance. The bandwidth of the proposed broadband MA is 3.4 THz with an absorptivity over 90% in the frequency band of 1.6-5 THz. The proposed absorber can switch to a reflector with a reflectivity over 93% by tuning the chemical potential of the graphene and reducing the temperature. Therefore, the switching intensity of the proposed MA exceeds 83%. The physical mechanisms of the broadband absorption of the proposed structure are investigated using the impedance matching theory and the multiple reflection interference theory. The reflection mechanism of the proposed broadband reflector is discussed by analyzing the effective parameters. The absorption and switching mechanism are theoretically investigated by performing detailed numerical calculations to analyze the surface loss intensity, electric field, and magnetic field. These findings can accelerate the development of terahertz broadband switchable devices.
KW - Terahertz bifunctional device
KW - broadband metamaterial absorber/reflector
KW - electric dipole
KW - magnetic dipole
KW - switching intensity
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U2 - 10.1109/JPHOT.2021.3109045
DO - 10.1109/JPHOT.2021.3109045
M3 - Article
AN - SCOPUS:85115165309
VL - 13
JO - IEEE Photonics Journal
JF - IEEE Photonics Journal
SN - 1943-0655
IS - 5
ER -