期刊
OPTICAL MATERIALS
卷 113, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.optmat.2021.110807
关键词
Broadband optical diode; Weyl semimetals; Giant magneto-optical parameter; Asymmetric and tunable light localization; Edge mode; Unusual strong trapped integral light energy
The new properties of optical diodes were investigated in isotropic magnetoactive layer, magnetophotonic crystal layer, and photonic crystal with a helical structure, showing potential for broadband ideal optical diodes. The appearance of a new photonic band gap for helically structured photonic crystals and strong light localization at some modes were observed, with trapped total light energy and energy density peculiarities being examined.
Some new properties of optical diodes were investigated, as well as compared with the known ones for the following three systems: 1) an isotropic magnetoactive layer, 2) a magnetophotonic crystal layer, and 3) a photonic crystal with a helical structure, assuming that these systems are in an external magnetic field and have giant parameters of magneto-optical activity. It is shown that these systems can be used as broadband ideal optical diodes. At giant values of the magneto-optical activity in the long-wavelength region of the spectrum, there appears a new photonic band gap (PBG) for helically structured photonic crystals. Accordingly, two PBGs and a transparent window between them appear in the whole spectral region. When magneto-optical activity parameter increases, this new (the second) PBG occupies the entire spectrum. Furthermore, the light localization at the edge modes is investigated. It is shown that an unusually strong light localization takes place at some modes. The trapped total light energy and the energy density peculiarities are investigated, too.
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