Experimental Investigation of the Polarization Plane Rotation of Light in Cholesteric Liquid-Crystalline Film with an Anisotropic Defect Layer

Alaverdyan, R. B.; Gevorgyan, A. H.; Gharagulyan, H.; Grigoryan, H.

doi:10.1080/15421406.2012.658679

Cited by 7 publications

(2 citation statements)

References 11 publications

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“…17 Let us note that the polyimide layer used in our experiment does not have optical anisotropy which was proven by experiment. 17 Let us note that the polyimide layer used in our experiment does not have optical anisotropy which was proven by experiment.…”

Section: Sample Preparation and Experimentsmentioning

confidence: 59%

Diffusion in liquid crystals of two cholesterics with different pitches

et al. 2015

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The properties of chiral photonic crystals with a pitch gradient were investigated both experimentally and theoretically. The liquid-crystalline cell was prepared by bringing two cholesteric liquid crystals (CLCs) with different pitches into contact. There are some essential features in the dynamics of diffusion between the two CLCs. The most important feature is the fact that establishing the final equilibrium pitch (for the temperatures below 17°C) takes a long time -roughly 3 months or more-which, in turn, allows us to investigate the nonstandard change in the reflection spectra during the diffusion. The two reflection curves do not directly actually get closer and merge into one peak, as usual, but the left one gradually gets smaller and almost vanishes, and the right one expands. For this reason, a theoretical model of a pitch change was developed and it was seen that this model does not coincide with the classical ideas of the pitch change. It was also assumed that due to the "freezing" effect during the diffusion process, one could have fixed the intermediate states of the pitch gradient.

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Section: Sample Preparation and Experimentsmentioning

confidence: 59%

Diffusion in liquid crystals of two cholesterics with different pitches

et al. 2015

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“…Furthermore, these materials self-organize their periodic structure and form a photonic bandgap (PBG) where circularly polarized light with the same handedness as that of the CLC helix cannot propagate [ 6 ]. Several studies on chiral photonic crystals have shown that it is possible to create localized optical modes within the PBG by inducing a defect into the periodic structure [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Multimode Robust Lasing in a Dye-Doped Polymer Layer Embedded in a Wedge-Shaped Cholesteric

et al. 2021

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Cholesteric liquid crystals (CLCs) with induced defects are one of the most prominent materials to realize compact, low-threshold and tunable coherent light sources. In this context, the investigation of optical properties of induced defect modes in such CLCs is of great interest. In particular, many studies have been devoted to the spectral control of the defect modes depending on their thickness, optical properties, distribution along the CLC, etc. In this paper, we investigate the lasing possibilities of a dye-doped polymer layer embedded in a wedge-shaped CLC. We show that multimode laser generation is possible due to the observed multiple defect modes in the PBG that enlarges the application range of the system. Furthermore, our simulations based on a Berreman 4 × 4 matrix approach for a wide range of CLC thickness show both periodic and continuous generation of defect modes along particular spectral lines inside the PBG. Such a robust spectral behaviour of induced defect modes is unique, and, to our knowledge, is not observed in similar CLC-based structures.

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