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Applied Physics A

, 125:792 | Cite as

Double-band perfect absorber based on the dielectric grating and Fabry–Perot cavity

  • Fang ChenEmail author
  • Huafeng Zhang
  • Lihui Sun
  • Jijun Li
  • Chunchao Yu
Article
  • 59 Downloads

Abstract

To realize double-band perfect absorption, in this paper, we present a theoretical study of plasmonic absorption based on a metal–dielectric grating nanostructure. The structure consists of subwavelength periodic \( {\text{Al}}_{2} {\text{O}}_{3} \) grating covered with metal grating with a metal substrate. Results show that the one of the two absorption bands is caused by the Fabry–Perot resonance in the gold grating slits, and the other absorption band is caused by the gap plasmonic resonance of the \( {\text{Al}}_{2} {\text{O}}_{3} \) dielectric grating. The effect of structural parameters on absorption is also studied, the field distribution of the proposed nanostructure is presented to illustrate the absorption mechanism. Moreover, the two absorption peaks can be adjusted individually with different geometrical parameters. The results will pave the way towards the design of double-band plasmonic perfect absorber, which may have potential application in plasmonic absorption switch, plasmonic sensors and photodetectors.

Notes

Funding

Supported by The Yangtze Youth Fund (Grant no. 2016cqn55), Yangtze Fund for college students’ innovation and entrepreneurship (Grant no. 2018173). Yangtze Fund for Youth Teams of Science and Technology Innovation (Grant no. 2015cqt03), National Natural Science Foundation of China (Grant no. 11747091).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Fang Chen
    • 1
    Email author
  • Huafeng Zhang
    • 1
  • Lihui Sun
    • 1
  • Jijun Li
    • 1
  • Chunchao Yu
    • 1
  1. 1.Institute of Quantum Optics and Information Photonics, School of Physics and Optoelectronic EngineeringYangtze UniversityJingzhouPeople’s Republic of China

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