With the simultaneous presence of positive and negative components both in the permittivity tensor ɛ
ij
and in the tensor of magnetic permeability μ
ij
, the propagation of an electromagnetic wave in ...optically homogeneous anisotropic media, and in periodically inhomogeneous media with a spiral structure is considered. It is shown that depending on polarization, such media exhibit the properties of both dextrorotatory and levorotatory substances. It is shown also that the medium with a spiral periodic structure may have the property of total diffraction reflection of the wave of any polarization. In the case of the presence of different signs of components of ɛ
ij
and μ
ij
in the spiral medium, it is revealed that two regions of diffraction reflection are formed, corresponding to the two waves with circular polarization with mutually opposite rotation of the polarization.
Full text
Available for:
EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Fraunhofer diffraction of light by a slit on an opaque screen located between a vacuum and a homogeneous anisotropic medium in the absence and in the presence of absorption at different orientations ...of the optical axis of the medium relative to the slit is considered. The well-known formula for the diffraction in a vacuum is generalized, with the inclusion of the case of diffraction into a uniaxial anisotropic medium in the absence of absorption. A formula is obtained that makes it possible to determine the directions of the diffraction minima and maxima taking into account this absorption.
Full text
Available for:
EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Abstract Fraunhofer diffraction of an electromagnetic wave by a slit on an opaque screen located between vacuum and an anisotropic medium with closed and open wave vectors surface is considered. A ...formula for diffraction in a material medium is obtained, including the case of diffraction into a uniaxial anisotropic medium in the absence of absorption, and the formation of diffraction minima and maxima is studied.
We study the behavior of rotation of polarization plane when passing from positive to negative dielectric and magnetic susceptibilities of a gyrotropic medium for two formulations of material ...equations in such media.
Full text
Available for:
EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The forms of surfaces of wave vectors (SWVs) of the known media are considered and the systematization of them by the form of SWVs is made. Characteristic features of optical properties of the media ...caused by the new forms of SWVs are indicated.
Full text
Available for:
EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Influence of an external magnetic field and a spatial dispersion of the dielectric permittivity on the irreversibility of waves in magnetoelectric media is considered. Features of the azimuth ...inhomogeneity at the simultaneous anisotropy of the dielectric permittivity and magnetic permeability in these media are studied.
Full text
Available for:
EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The interaction of light with Cholesteric Liquid Crystals (CLC) in the presence of time dispersion, magnetooptical activity and absorption is considered. The magnetooptical activity leads to the ...waves irreversibility, i.e. to the absence of center of symmetry for the surface of wave vectors and other surfaces, characterizing the direction dependence of optical properties (the nonequivalency of the forward and backward directions of propagation occurs). The waves irreversibility effects in CLC and their influence on the geometry of the Bragg reflection are considered.
The time dispersion leads both to the splitting of region of diffraction reflection, and to the appearance of new region of diffraction reflection. Near the isotropic point it is possible to get a narrow region of diffraction reflection with tunable width and location.
The results present also interest for the electrodynamics of media with waves irreversibility. They can be used no only in CLC optics but also in microwave electrodynamics of artificial ferromagnetic helical media.
Full text
Available for:
BFBNIB, GIS, IJS, KISLJ, NUK, PNG, UL, UM, UPUK
PDF
