Journal
OPTICAL MATERIALS EXPRESS
Volume 9, Issue 4, Pages 1562-1576Publisher
OPTICAL SOC AMER
DOI: 10.1364/OME.9.001562
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Funding
- National Natural Science Foundation of China [61875106, 61775123]
- Natural Science Foundation of Shandong Province, China [ZR2016FM09, ZR2016FM32]
- SDUST topnotch talent project 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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Tunable polarization-nonsensitive electromagnetically induced transparency (EIT) based on Dirac semimetal films (DSF) at terahertz frequencies is numerically studied in this paper. We first numerically investigate the EIT effect in a DSF-based terahertz metamaterial structure comprising a DSF strip and two DSF L-shaped resonators. To achieve the polarization-nonsensitive EIT effect, we introduce one vertical strip and two more L-shaped resonators to the above structure. The transmission spectra of the new structure show strong polarization-nonsensitive characteristic because of the fourfold symmetry. By analyzing the surface currents and electric field distribution at the resonant frequencies, we demonstrate that an EIT effect arises from the bright-bright mode coupling. Moreover, the polarization-nonsensitive EIT structure exhibits a blue shift with the increase in the Fermi energy of the DSF without having to re-optimize its geometrical parameters. Our study opens a new path for developing terahertz devices such as terahertz switches. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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