Journal
OPTICAL MATERIALS EXPRESS
Volume 10, Issue 2, Pages 369-386Publisher
OPTICAL SOC AMER
DOI: 10.1364/OME.383008
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Funding
- National Natural Science Foundation of China [61875106, 61775123]
- Key Technology Research and Development Program of Shandong [2019GGX104039, 2019GGX104053]
- Shandong University of Science and Technology Top-Notch Talent Project for Young Teachers for Young Teachers [BJRC20160505]
- Shandong Graduate Student Tutor Guidance Ability Promotion Program Project [SDYY17030]
- National Key Research and Development Program of China [2017YFA0701000]
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We propose a dual-controlled switchable broadband terahertz (THz) metamaterial absorber based on a hybrid of vanadium dioxide (VO2) and graphene that demonstrates strong polarization-independent characteristics and works well at a wide range of incidence angles. The peak absorptance of the proposed absorber can be tuned from 26 to 99.2% by changing the Fermi energy of the graphene; the absorptance can be dynamically tuned from 9 to 99.2% by adjusting the conductivity of the vanadium dioxide because of its unique insulator-to-metal transition characteristic. Using these two independent controls in tandem, we found that the state of the proposed absorber can be switched from absorption (>96%) to reflection (>73.5%), and the transmittance can be tuned from 0% to 65% while maintaining broad bandwidth (1.05-1.6 THz), resulting in a better-performing switchable broadband terahertz absorber. Furthermore, we have provided a discussion of the interference theory in which the physical mechanism of the absorption is explained from an optical point of view. The absorber achieves dual-controlled absorptance switching via two independently controllable pathways, offering a new method for switching and modulation of broadband THz radiation. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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