Abstract
As a new localized state of light, the chiral optical Tamm state exists at the interface between a polarization-retaining anisotropic mirror and a substance with optical activity. Considering a hybrid structure comprising a metal-free polarization-preserving mirror and a cholesteric liquid crystal, we highlight the high Q factor arising from the all-dielectric framework. The intensity of localized light decreases exponentially with increasing distance from the interface. The penetration of the field into the cholesteric liquid crystal is essentially prohibited for wavelengths lying in the photonic bandgap and close to the cholesteric pitch length. The dielectric mirror has its own photonic bandgap. The energy transfer along the interface can be effectively switched off by setting the tangential wave vector to zero. The spectral behavior of the chiral optical Tamm state is observed both as reflection and transmission resonance. This Fano resonance is analogous to the Kopp–Genack effect. Our analytics are well in line with precise calculations, which may pave a new route for the future development of intelligent design for laser and sensing applications.
Highlights
The electromagnetic analog of the Tamm state of electrons on the superlattice interface is referred to as the optical Tamm state (OTS) [1]
polarization-preserving anisotropic mirror (PPAM) can be in the form of a flat interface of a metallo-dielectric nanocomposite consisting of spherical nanoparticles of silver dispersed in a transparent template
In Reference [28], it is shown that chiral optical Tamm state (COTS) can be considered strictly localized only when the anisotropies in the magnetic permeability and electric permittivities are equal in their values and the axes of the corresponding tensors coincide; otherwise, COTS is manifested in the form of the resonances of polarized reflection with two relaxation constants determined by the differences in permittivity and in thickness of the cholesteric layer
Summary
The electromagnetic analog of the Tamm state of electrons on the superlattice interface is referred to as the optical Tamm state (OTS) [1]. PPAM can be in the form of a flat interface of a metallo-dielectric nanocomposite consisting of spherical nanoparticles of silver dispersed in a transparent template Such a mirror transfers about 80% of the energy of an incident wave into a reflected wave with the same polarization in a particular spectral range [23]. In Reference [28], it is shown that COTS can be considered strictly localized only when the anisotropies in the magnetic permeability and electric permittivities are equal in their values and the axes of the corresponding tensors coincide; otherwise, COTS is manifested in the form of the resonances of polarized reflection with two relaxation constants determined by the differences in permittivity and in thickness of the cholesteric layer. The OTS can be further used for intelligent design for laser [36,37] and sensing applications [38]
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