Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 39, Issue 4, Pages 1195-1202Publisher
Optica Publishing Group
DOI: 10.1364/JOSAB.443778
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Funding
- Natural Science Foundation of Heilongjiang Province [LH2019A028, LH2020A014]
- Key Laboratory of Engineering Dielectrics and Its Application (Harbin University of Science and Technology), Ministry of Education [KFM202005]
- 13th Five-year Educational Science Planned Projects in Heilongjiang Province [GJB1319071]
- Postgraduate Course Construction Project
- Harbin Normal University Master's Innovation Project [HSDSSCX2020-24]
- Education Commission Heilongjiang Province [2020KYYWF352]
- National Natural Science Foundation of China [11104050, 11204056]
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This paper proposes a tunable terahertz metasurface absorber based on surface phonon polariton. The absorber achieves dynamic tunability, polarization independence, and angle insensitivity. By adjusting the Fermi energy of graphene, the absorber can switch between high absorptivity and low absorptance, maintaining high switching intensity at certain frequencies and incident angles.
A tunable terahertz (THz) metasurface (MS) absorber based on the surface phonon polariton (SPhP) is proposed based on a layered structure that consists of a split-silver-ring array followed by a graphene layer, polar crystal layer, and silver layer. A dynamically tunable, polarization-independent, and angle-insensitive MS absorber is numerically investigated at THz frequencies. By changing the Fermi energy of graphene from 0 to 1.0 eV, the state of the absorber can switch between the OFF state (with an absorptivity above 90%) and ON state (with an absorptance below 3%). The switching intensity (SI) of the absorber remains greater than 80% for TE incidence wave with incident angles from 0 degrees to 70 degrees and for TM incidence wave incident angles from 0 degrees to 40 degrees in the frequency range from 2.74 to 3.51 THz. These results should be helpful in guiding the design of THz tunable devices such as optical switches, smart absorbers, and imaging. (C) 2022 Optica Publishing Group
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