Chiral optical Tamm states at the boundary of the medium with helical symmetry of the dielectric tensor

Timofeev, Ivan V.; Vetrov, S. Ya.

doi:10.1134/s0021364016180119

Cited by 25 publications

(30 citation statements)

References 5 publications

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“…This expression is more exact in comparison with the earlier obtained approximation (Equation (10) in [44]) and still there remains approximation. We have to use a unified angleχ between the cholesteric optical axis and HPM, hence the electric and magnetic polarizations are directed differently in a general case.…”

Section: The Case Of Unequal Anisotropies δ = δ µmentioning

confidence: 77%

“…In other words, the cholesteric director, i.e., the unit vector of the preferred orientation of molecules, is constant in the interface-parallel cross-sections, and it uniformly rotates with increasing distance from the interface. Near the interface, a chiral optical Tamm state (COTS) is possible, described in [44] in the limit of low cholesteric anisotropy. This state can be represented as a superposition of two circularly polarized counter-propagating co-handed waves with their strengths rotating in time in opposite directions.…”

Section: Modelmentioning

confidence: 99%

“…This layer produces a set of localized states with nontrivial polarization properties [38,39]. Various combinations involving two mirrors have been extensively studied and proposed for practical applications [36,40], including less-than-one-pitch chiral layer [41][42][43][44][45][46]. The closer to the mirror, the higher the energy density of the states may become, but still the states are not localized at surface but within the bulk of the extra layer.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, HPM can be defined as a reflector with the effect of a half-wave phase plate [49]. A localized state at the HPM/cholesteric interface is described in the low-anisotropy approximation of cholesteric liquid crystal and is called a chiral optical Tamm state (COTS) [44].…”

Section: Introductionmentioning

confidence: 99%

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Chiral Optical Tamm States: Temporal Coupled-Mode Theory

et al. 2017

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Abstract: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 helical 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 only anisotropy in magnetic permittivity can ultimately cancel this coupling. These two couplings being equal result 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.

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Section: The Case Of Unequal Anisotropies δ = δ µmentioning

confidence: 77%

Section: Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chiral Optical Tamm States: Temporal Coupled-Mode Theory

et al. 2017

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“…In [32,33], we found the localized state in the structure containing a cholesteric liquid crystal. Later, a chiral analog of the TPP in a cholesteric liquid crystal was established [34]. In this case, the polarization-preserving anisotropic mirror made of a metal-dielectric nanocomposite was used as a metallic layer [35].…”

Section: Introductionmentioning

confidence: 99%

Two Types of Localized States in a Photonic Crystal Bounded by an Epsilon near Zero Nanocomposite

2018

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Abstract:The spectral properties of a one-dimensional photonic crystal bounded by a resonant absorbing nanocomposite layer with the near-zero permittivity have been studied. The problem of calculating the transmittance, reflectance, and absorptance spectra of such structures at the normal and oblique incidence of light has been solved. It is shown that, depending on the permittivity sign near zero, the nanocomposite is characterized by either metallic or dielectric properties. The possibility of simultaneous formation of the Tamm plasmon polariton at the photonic crystal/metallic nanocomposite interface and the localized state similar to the defect mode with the field intensity maximum inside the dielectric nanocomposite layer is demonstrated. Specific features of field localization at the Tamm plasmon polariton and defect mode frequencies are analyzed.

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Optical spectra for a cholesteric elastomer doped with metallic nanospheres with an inversion defect

Reyes

2023

Journal of Modern Optics

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Chiral optical Tamm states at the boundary of the medium with helical symmetry of the dielectric tensor

Cited by 25 publications

References 5 publications

Chiral Optical Tamm States: Temporal Coupled-Mode Theory

Chiral Optical Tamm States: Temporal Coupled-Mode Theory

Two Types of Localized States in a Photonic Crystal Bounded by an Epsilon near Zero Nanocomposite

Optical spectra for a cholesteric elastomer doped with metallic nanospheres with an inversion defect

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