Magnetically Induced Transparency in Media with Helical Dichroic Structure

Abstract

In our paper, the magneto-optical properties of a dichroic cholesteric liquid crystal layer with large values of magneto-optical parameter g and low values of dielectric permittivity were investigated. The solutions of the dispersion equation and their peculiarities were investigated in detail. The specific properties of reflection, transmission, absorption, rotation, ellipticity spectra and also the spectra of ellipticity and azimuth of eigen polarization were investigated. The existence of a tunable linear and nonreciprocal transmission band was shown.

Magnetically induced transparency and absorption in cholesteric liquid crystals

“…Consideration of this limiting case, below, will allow us to reveal many features of magnetooptical CLCs in their purest form, which in the more general case of Re∆≠ 0 have more complex manifestations. Some features of the optical properties of such media are considered in detail in [33][34][35]. In this case Eq.…”

“…The papers [16][17][18][19][20][21][22][23][24][25][26] present the results of a theoretical and experimental study of the magnetooptical properties of CLCs. Then, in the papers [27][28][29][30] the existence of MIT and MIA was demonstrated in short wavelength part of spectrum in CLCs being in external magnetic field both at the presence and absence of local dielectric anisotropy. In [31] it was reported about observation of Dirac points in CLCs, both in the presence of external magnetic field and in its absence.…”

“…It was shown that the MIT and MIA phenomena are observed exactly at the Dirac points. However, all the works [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] deal with the case when the parameter of magneto-optical activity g is constant and is independent of wavelength. It was shown in [32] that in the case of the wavelength dependence of the magneto-optical activity parameter in the short-wavelength spectrum, no MIT effect nor MIA effect is observed.…”

Dirac Points in Chiral Liquid Crystals

“…In the papers [41][42][43][44][45][46][47][48][49][50] the results of a theoretical and experimental study of the magneto-optical properties of CLCs are presented. Moreover, in the papers [51][52][53][54] the existence of MIT and MIA was demonstrated. In [55] it was reported about observation of Dirac points in CLCs.…”

“…It was shown that the MIT and MIA phenomena are observed near the Dirac points. Let us note, that all the works [51][52][53][54][55] deal with the case when the parameter of magneto-optical activity g is constant and is independent of wavelength. In this paper, we will discuss the possibility of observing Dirac points and lines and exceptional points and lines in magnetically active CLCs in the case when the parameter of magneto-optical activity g is function of wavelength.…”