We report the discovery, theoretically, of new effects, namely, the effects of magnetically induced transparency/absorption. The effects are observed in a magnetically active helically structured periodical medium. Changing the external magnetic field and absorption, one can tune the frequency and the linewidth of the transparency/absorption band. We have shown that both effects can be simultaneously observed for two eigenmodes of a cholesteric liquid crystal (CLC) layer. Both effects are nonreciprocal and tunable. They can be observed in the case of the absence of dispersion of the dielectric and the magnetic tensor components, as well as in the case of dispersion dependences of optical parameters of the CLC layer. Comparison of these effects show that while the effect of magnetically induced transparency is observed at wide intervals of variation of the parameters of the CLC layer, the effect of magnetically induced absorption can observe only in very small intervals of these parameters.
Peculiarities of optical absorption spectra of NdFe$_3$(BO$_3$)$_4$ crystal in magnetically ordered state and at the transition to spiral magnetic phase
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine（乌克兰国家科学院 B.维尔金低温物理与工程学院）
Magnetically Induced Transparency-Absorption and Normal-Anomalous Dispersion Characteristics of ${}^{87}\text{Rb}$ Medium or Any J-Type Configuration Atomic Vapors Subject to a Vector Magnetic Field and a Weak Resonant Pump
Alikhanyan National Laboratory (Yerevan Physics Institute)（阿利哈尼扬国家实验室（耶烈万物理研究所））；Institute for Physical Research, Armenian National Academy of Sciences（亚美尼亚国家科学院物理研究所）
Observation of Chiral Bound States in the Continuum in Self-biased Magneto-optical Photonic Crystals
Southern University of Science and Technology（南方科技大学）；University of Electronic Science and Technology of China（电子科技大学）；Chongqing University of Technology（重庆理工大学）；Beijing Institute of Technology, Zhuhai（北京理工大学珠海学院）
Dirac points, new photonic band gaps and effect of magnetically induced transparency in dichroic cholesteric liquid crystals with wavelength dependent magnetooptical activity parameter
