Dual-Band Plasmonic Perfect Absorber Based on Graphene Metamaterials for Refractive Index Sensing Application

Zao Yi; Cuiping Liang; Xifang Chen; Zigang Zhou; Yongjian Tang; Xin Ye; Yougen Yi; Junqiao Wang; Pinghui Wu

doi:10.3390/mi10070443

Dual-Band Plasmonic Perfect Absorber Based on Graphene Metamaterials for Refractive Index Sensing Application

Micromachines (Basel). 2019 Jul 2;10(7):443. doi: 10.3390/mi10070443.

Authors

Zao Yi^{1

2}, Cuiping Liang^{1

2}, Xifang Chen^{1

2}, Zigang Zhou^{1

2}, Yongjian Tang^{1

2}, Xin Ye³, Yougen Yi⁴, Junqiao Wang⁵, Pinghui Wu⁶

Affiliations

¹ Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China.
² Sichuan Civil-Military Integration Institute, Mianyang 621010, China.
³ Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621010, China.
⁴ College of Physics and Electronics, Central South University, Changsha 410083, China.
⁵ School of Physics and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450001, China.
⁶ Photonic Technology Research & Development Center, Key Laboratory of Information Functional Material for Fujian Higher Education, Quanzhou Normal University, Quanzhou 362000, China. phwu@zju.edu.cn.

Abstract

We demonstrate a dual-band plasmonic perfect absorber (PA) based on graphene metamaterials. Two absorption peaks (22.5 μm and 74.5 μm) with the maximal absorption of 99.4% and 99.9% have been achieved, respectively. We utilize this perfect absorber as a plasmonic sensor for refractive index (RI) sensing. It has the figure of merit (FOM) of 10.8 and 3.2, and sensitivities of about 5.6 and 17.2 μm/RIU, respectively. Hence, the designed dual-band PA-based RI sensor exhibits good sensing performance in the infrared regime, which offers great potential applications in various biomedical, tunable spectral detecting, environmental monitoring and medical diagnostics.

Keywords: graphene; metamaterials; refractive index sensor; surface plasmon resonance.

Grants and funding

51606158/National Natural Science Foundation of China