Journal
OPTICS COMMUNICATIONS
Volume 468, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2020.125802
Keywords
Dirac semimetal; Polarization conversion; Polarization rotation; Dynamically tunable
Categories
Funding
- National Natural Science Foundation of China [61875106, 61775123]
- Key Research and Development Program of Shandong Province, China [2019GGX104039, 2019GGX104053]
- Shandong graduate student tutor guidance ability promotion program project, China [SDYY17030]
- National key research and development program of China [2017YFA0701000]
- Scholarship Fund of SDUST
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A three-layer complementary strip Dirac semimetal polarizer is proposed to achieve polarization rotation, perfect polarization conversion, and asymmetric transmission. This device can realize broadband polarization operation of linear polarized waves in the terahertz frequency domain. By changing the Fermi level of the Dirac semimetal, the polarization angle of linearly polarized light in the frequency range of 1.3 to 1.63 THz can be rotated from 0 degrees to 90 degrees, and the device has good robustness for linearly polarized light with different incident angles. When used as an asymmetric transmission device, its polarization conversion efficiency reaches more than 98% and the asymmetric transmission parameter reaches more than 50% in the range of 1.3-1.63 THz. The asymmetric transmission parameters, polarization conversion ratio, polarization rotation angle, and ellipticity are used to describe the performance of the converter.
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