The results are presented of spectral calculations of extinction cross-section for scattering of E- and H-polarized electromagnetic
waves by cylinders made of Veselago material. The insolvency of previously developed models of scattering is demonstrated. It is shown that correct description of scattering requires separate consideration of both electric and magnetic subsystems.
The optical properties of composite material made of metal nanospheres situated in the sites of three-dimensional lattice and embedded into dielectric matrix are considered. It is demonstrated that index of refraction of composite medium may acquire unit value at certain relations between dielectric constants. The method is developed for the description of optical properties of composite medium that takes into account retardation effects in nanospheres interactions. It is shown that obtained results coincide with Maxwell-Garnett theory in the limit of infinitesimal distances between nanospheres with respect to wavelength.
The results are presented of spectral calculations of extinction cross-section for scattering of E- and H-polarized electromagnetic waves by cylinders made of Veselago material. The insolvency of previously developed models of scattering is demonstrated. It is shown that correct description of scattering requires separate consideration of both electric and magnetic subsystems.
The optical properties of composite material made of metal nanospheres situated in the sites of three-dimensional lattice and embedded into dielectric matrix are considered. It is demonstrated that index of refraction of composite medium may acquire unit value at certain relations between dielectric constants. The method is developed for the description of optical properties of composite medium that takes into account retardation effects in nanospheres interactions. It is shown that obtained results coincide with Maxwell-Garnett theory in the limit of infinitesimal distances between nanospheres with respect to wavelength.
In the frames of quantum electrodynamics, the behavior of spontaneous decay is investigated for a single two-level atom embedded into a microscopic object (cluster). The transition frequency of cluster atoms is supposed to be considerably detuned from the transition frequency of decaying atom. The consideration is performed on the base of fully microscopic quantum-electrodynamical approach with simultaneous solution of Heisenberg equations for atomic and quantum field operators. The special attention is paid to the investigation of renormalization of spontaneous emission rate due to proper account of discrete structure of medium. The formula for decay rate is obtained without using the notion of refractive index. It is obtained that spontaneous decay strongly depends on the geometrical arrangement of atoms in microstructure. For some form of clusters, decay rate is found to be considerably large compared to its vacuum value that is not the case for macroscopically large dielectrics.
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