Abstract
This numerical study demonstrates the possibility of exciting a chiral optical Tamm state localized at the interface between a cholesteric liquid crystal and a polarization-preserving anisotropic mirror conjugated to a metasurface. The difference of the proposed structure from a fully dielectric one is that the metasurface makes it possible to decrease the number of layers of a polarization-preserving anisotropic mirror by a factor of more than two at the retained Q-factor of the localized state. It is shown that the proposed structure can be used in a vertically emitting laser.
Highlights
A hot topic in photonics is the optimization of Q-factor for localized states.These can be conventional defect modes of a photonic crystal and optical Tamm states (OTSs) excited at the interface between two multilayer mirrors [1,2]
The localized state is called the Tamm plasmon polariton (TPP) [3], which is analogous to the electronic Tamm state in solid state physics [4]
The reflection spectra of the cholesteric liquid crystal (CLC)–polarization-preserving anisotropic mirror (PPAM) structure calculated by the Berreman and finite-difference time-domain (FDTD) methods show that, at the interface between the CLC and the PPAM, the chiral optical Tamm state (COTS)
Summary
A hot topic in photonics is the optimization of Q-factor for localized states. Due to the helical symmetry of the CLC permittivity tensor and the periodicity of a helical pitch, the CLC is a one-dimensional photonic crystal (PC) with a photonic band gap in its spectrum Such a chiral structure leads to diffraction of light circularly polarized in the helical twisting direction. The reflected wave retains the circular polarization of the same sign In this case, it is difficult to excite the OTS at the interface between the chiral and achiral mirrors. The second way is to combine a chiral medium with an anisotropic mirror [23,28,29,30,31] Such a mirror retains the polarization sign at the reflection of light, i.e., the wave reflected from the mirror boundary has the same polarization as the incident wave. The use of a hybrid mirror simplifies the fabrication of the structure and makes it possible to optimize and control its spectral properties
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