Abstract
The resonant splitting of optical Tamm state numerically is demonstrated. The Tamm state is localized at the interface between a resonant chiral medium and a polarization-preserving anisotropic mirror. The chiral medium is considered as a cholesteric liquid crystal doped with resonant dye molecules. The article shows that the splitting occurs when dye resonance frequency coincides with the frequency of the Tamm state. In this case the reflectance, transmittance, and absorptance spectra show two distinct Tamm modes. For both modes, the field localization is at the interface between the media. The external field control of configurable optical and structural parameters paves the way for use in tunable chiral microlaser.
Highlights
There have been an increasing number of fundamental and applied works devoted to searching for new promising materials and designing the structures that exploit new ways of controlling light
cholesteric liquid crystal (CLC) refractive indices, the CLC band gap lies in the wavelength range of 580–670 nm, which is 20 nm higher than the polarization-preserving anisotropic mirror (PPAM) band gap with the boundaries from 595 to 665 nm
It is well-known that the complete or partial overlap of the band gaps in the energy spectrum is a condition for the formation of a chiral optical Tamm state (COTS) at the interface between two media
Summary
There have been an increasing number of fundamental and applied works devoted to searching for new promising materials and designing the structures that exploit new ways of controlling light. The presence of dye molecules can lead to the qualitative rearrangement of the band structure of the CLC spectrum, to splitting of the photonic band gap (PBG). A fundamentally new effect of COTS splitting at the interface between the media at the coinciding dye and COTS resonant frequencies was established In this case, two energy levels corresponding to two new COTSs were observed at the intersection of the DDCLC and PPAM band gaps. The complete or partial overlap of the band gaps of CLC and PPAM in the energy spectrum is a condition for the COTS formation at the two environments border plane In this case, the energy level occurs at the overlap of the band gaps corresponding to the chiral optical Tamm mode localized at the interface of the environments. When reconstructing from the resonance, the splitting effect of COTS is persistent as long as the COTS lies in the frequency dispersion of the dye molecules
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