Photonic Density of States of a Stack of Cholesteric Liquid Crystal and Isotropic Medium Layers

Gevorgyan, A. H.; Harutyunyan, M. Z.; Matinyan, G K; Mkhitaryan, S. A.

doi:10.1088/1742-6596/517/1/012034

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…Subsequently, they realized a quasi-periodic system using single-pitch CLCs and isotropic films of polyvinyl alcohol and fabricated a red-green-blue reflector [15]. There were further theoretical studies that considered reflectors [16,17,18], studied optical properties of composites of CLCs and isotropic layers [19,20,21,22] or calculated the DOS of a stack structure of CLCs and isotropic medium [23,24]. However, up until now, very little attention has been paid to the coupling of defect modes in such composite assemblies.…”

Section: Introductionmentioning

confidence: 99%

Coupling of Defect Modes in Cholesteric Liquid Crystals Separated by Isotropic Polymeric Layers

et al. 2018

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Abstract:Cholesteric liquid crystal structures with multiple isotropic defect layers exhibit localized optical modes (defect modes). Coupling effects between these modes were simulated using the finite difference time domain method. Analogous to the well-known result of the tight-binding approximation in solid state physics, splitting of the defect modes takes place, as soon as the structure contains more than one defect layer. The dispersion relation of the mini-bands forming within the photonic band gap of the structure is calculated numerically. The structures might have promising applications for multiwavelength filters and low-threshold lasers.

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Section: Introductionmentioning

confidence: 99%

Coupling of Defect Modes in Cholesteric Liquid Crystals Separated by Isotropic Polymeric Layers

et al. 2018

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“…Then, the transmitted light passes through the glass plate with preserved polarization. Afterwards, the slightly attenuated pump light enters the second layer with the same helicity (LCPL) [ 32 , 33 ], and consequently induces stimulated emission in the second active medium (C540A dye). In principle, lasing emission is possible for both CPL components, but only the LCPL can reach a strong enough gain.…”

Section: Resultsmentioning

confidence: 99%

Electrically Tunable Two-Color Cholesteric Laser

Saadaoui,

Yang,

Wang

et al. 2023

Polymers

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Two-color lasing emission from an asymmetric structure, consisting of two dye-doped cholesteric liquid crystal (DD-CLC) layers separated by a transparent interlayer, is demonstrated. The DD-CLC mixtures have different reflection bands with long-wavelength band edges located at the green and red wavelengths of the visible spectrum, respectively. For the laser action, the CLC hosts provide the feedback, and the fluorescent laser dyes represent the active medium. When the stacked structure is optically pumped above the threshold, two simultaneous laser lines separated by 123 nm are observed at the long-wavelength band edges of the DD-CLC mixtures. The influence of an electric field on lasing behavior is also analyzed and discussed in terms of the reflection spectrum and laser action. The results show a reversible tuning of the reflection band, accompanied by a modification of the lasing characteristics under the application of an external field. Above a specific threshold voltage, one of the emission lines is suppressed and the other is conserved. With a further increase in the voltage, both laser emissions are entirely inhibited. The investigated structure demonstrates a simple technique to obtain an electrically tunable multi-wavelength laser, which might pave the way for a new generation of organic laser sources.

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“…They find a wide range of applications, in particular, in display manufacturing. The formation of multiple PBSs in one-dimensional multilayer structures containing CLC and isotropic layers has been reported in theoretical and experimental studies [4][5][6][7][8][9] . Analogous studies of one-dimensional multilayer structures including CLC and anisotropic layers were reported in 10 .…”

Section: Introductionmentioning

confidence: 92%

“…Here, we report the studies of optical, polarization, and lasing properties of a multilayer system consisting of CLC and isotropic medium layers ( Fig. 1) that were not considered in [4][5][6][7][8][9] . We discovered many new interesting properties of this system, which can find important applications.…”

Section: Introductionmentioning

confidence: 99%

Photonic density of states of a stack of cholesteric liquid crystals and isotropic medium layers

et al. 2014

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We investigated the zone structure peculiarities and the photonic density of states (PDS) of the eigen polarizations (EPs) in the system composed of a stack of layers of a cholesteric liquid crystal (CLC) and an isotropic medium. The problem was solved by Ambartsumian's layer addition modified method. The influence of the CLC sublayer thicknesses and the thicknesses of the isotropic media layers on the reflection an PDS spectra of the system is investigated.

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Photonic Density of States of a Stack of Cholesteric Liquid Crystal and Isotropic Medium Layers

Cited by 4 publications

References 12 publications

Coupling of Defect Modes in Cholesteric Liquid Crystals Separated by Isotropic Polymeric Layers

Coupling of Defect Modes in Cholesteric Liquid Crystals Separated by Isotropic Polymeric Layers

Electrically Tunable Two-Color Cholesteric Laser

Photonic density of states of a stack of cholesteric liquid crystals and isotropic medium layers

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