Metal–Dielectric Polarization-Preserving Anisotropic Mirror for Chiral Optical Tamm State

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.

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

Crystals ◽

10.3390/cryst9100502 ◽

2019 ◽

Vol 9 (10) ◽

pp. 502 ◽

Cited By ~ 4

Author(s):

Natalya V. Rudakova ◽

Ivan V. Timofeev ◽

Rashid G. Bikbaev ◽

Maxim V. Pyatnov ◽

Stepan Ya. Vetrov ◽

...

Keyword(s):

Liquid Crystal ◽

Photonic Bandgap ◽

Cholesteric Liquid Crystal ◽

Hybrid Structure ◽

Dielectric Polarization ◽

Transmission Resonance ◽

Localized State ◽

Sensing Applications ◽

Dielectric Mirror ◽

Tamm State

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.

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Chiral Optical Tamm States at the Interface between a Dye-Doped Cholesteric Liquid Crystal and an Anisotropic Mirror

Materials ◽

10.3390/ma13153255 ◽

2020 ◽

Vol 13 (15) ◽

pp. 3255

Author(s):

Anastasia Yu. Avdeeva ◽

Stepan Ya. Vetrov ◽

Rashid G. Bikbaev ◽

Maxim V. Pyatnov ◽

Natalya V. Rudakova ◽

...

Keyword(s):

Liquid Crystal ◽

External Field ◽

Structural Parameters ◽

Cholesteric Liquid Crystal ◽

Chiral Medium ◽

Dye Molecules ◽

Field Control ◽

Tamm State ◽

The Media ◽

Field Localization

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.

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