Geometric phase and o-mode blue shift in a chiral anisotropic medium inside a Fabry-P\'erot cavity

Anomalous spectral shift of transmission peaks is observed in a Fabry--P\'erot cavity filled with a chiral anisotropic medium. The effective refractive index value resides out of the interval between the ordinary and the extraordinary refractive indices. The spectral shift is explained by contribution of a geometric phase. The problem is solved analytically using the approximate Jones matrix method, numerically using the accurate Berreman method and geometrically using the generalized Mauguin--Poincar\'e rolling cone method. The $o$-mode blue shift is measured for a 4-methoxybenzylidene-4'-$n$-butylaniline twisted--nematic layer inside the Fabry--P\'erot cavity. The twist is electrically induced due to the homeoplanar--twisted configuration transition in an ionic-surfactant-doped liquid crystal layer. Experimental evidence confirms the validity of the theoretical model.Comment: the text is available both in English (Timofeev2015en.tex) and in Russian (download: other formats - source - Timofeev2015ru.tex, Timofeev2015rus.pdf

The optical Tamm states at the edges of a photonic crystal bounded by one or two layers of a strongly anisotropic nanocomposite

The optical Tamm states localized at the edges of a photonic crystal bounded by a nanocomposite on its one or both sides are investigated. The nanocomposite consists of metal nanoinclusions with an or- ientation-ordered spheroidal shape, which are dispersed in a transparent matrix, and is characterized by the effective resonance permittivity. The spectrum of transmission of the longitudinally and transversely polarized waves by such structures at the normal incidence of light was calculated. The spectral mani- festation of the Tamm states caused by negative values of the real part of the effective permittivity in the visible spectral range was studied. Features of the spectral manifestation of the optical Tamm states for different degrees of extension of spheroidal nanoparticles and different periods of a photonic crystal were investigated. It is demonstrated that splitting of the frequency due to elimination of degeneracy of the Tamm states localized at the interfaces between the photonic crystal and nanocomposite strongly depends on the volume fraction of the spheroids in the nanocomposite and on the ratio between the polar and equatorial semiaxes of the spheroid. Each of the two orthogonal polarizations of the incident wave has its own dependence of splitting on the nanoparticle density, which makes the transmission spectra polarization-sensitive. It is shown that the Tamm state is affected by the size-dependent per- mittivit

Chiral Optical Tamm States at the Interface between a Cholesteric and an All-Dielectric Polarization-Preserving Anisotropic Mirror

The chiral optical Tamm state is a new localized state of light at the interface between a polarization-preserving anisotropic mirror and an optically chiral medium such as a cholesteric liquid crystal. In this study the metal-free polarization-preserving mirror is used for efficient resonance control. We stress the advantage of the all-dielectric structure in obtaining high Q factor. The light is localized near the interface and the field decreases exponentially with the distance from the interface. The penetration of the field into the chiral medium is virtually blocked at wavelengths corresponding to the photonic band gap and close to the pitch of the helix. The polarization-preserving mirror has another photonic band gap as well. Our analytics agrees well with precise calculations, enabling intelligent design for laser and sensing applications.Comment: in Russia

Renormalization the quantum field model of particle interaction

The model simulates the interaction of abstract entities distinguished in a physical experiment and denoted as particles. Empirical data results in the non-hermitian anti-symmetric matrix of particle relationship. The real and imaginary parts of the matrix correspond to symmetric and asymmetric coupling of particles. The relationship matrix evolves to multiplication of pure defined hermitian metric tensor and curvature vector. The real spectrum of metric tensor extended into the complex space with invariant spectrum power results in renormalized non-singular quantum field model of particle interaction.Рассматривается модель взаимодействия абстрактных сущностей, различимых в физическом эксперименте и названных частицами. Эмпирические данные представлены в форме неэрмитовой антисимметрической матрицы взаимодействия частиц. Вещественные и мнимые элементы матрицы соответствуют симметрической и асимметрической составляющим взаимодействующей пары частиц. Матрица взаимодействия приведена к произведению слабо обусловленного эрмитового метрического тензора на вектор кривизны. Вещественный спектр метрического тензора расширен в комплексную область с условием инвариантности мощности спектра, в результате чего получена ренормализованная несингулярная квантово-полевая модель взаимодействия частиц.Розглянуто модель взаємодії абстрактних сутностей, помітних у фізичному експерименті і названих частками. Емпіричні дані представлені у вигляді неермітової антисиметричної матриці взаємодії часток. Дійсні та уявні елементи матриці відповідають симетричній та асиметричній складовим взаємодіючої пари часток. Матриця взаємодії приведена к добутку слабо обумовленого метричного тензора на вектор кривизни. Дійсний спектр метричного тензора розширено у комплексну область за умови інваріантності потужності спектру, в результаті чого отримано ренормалізовану несингулярну квантово-польову модель взаємодії часток

Hinton, Deane R.

The chiral optical Tamm state (COTS) is a special localized state at the interface of a handedness-preserving mirror and a structurally chiral medium such as a cholesteric liquid crystal or a chiral sculptured thin film. The spectral behavior of COTS, observed as reflection resonances, is described by the temporal coupled-mode theory. Mode coupling is different for two circular light polarizations because COTS has a helix structure replicating that of the cholesteric. The mode coupling for co-handed circularly polarized light exponentially attenuates with the cholesteric layer thickness since the COTS frequency falls into the stop band. Cross-handed circularly polarized light freely goes through the cholesteric layer and can excite COTS when reflected from the handedness-preserving mirror. The coupling in this case is proportional to anisotropy of the cholesteric and theoretically it is only anisotropy of magnetic permittivity that can ultimately cancel this coupling. These two couplings being equal results in a polarization crossover (the Kopp--Genack effect) for which a linear polarization is optimal to excite COTS. The corresponding cholesteric thickness and scattering matrix for COTS are generally described by simple expressions