Dissipative structures induced by photoisomerization in a dye-doped nematic liquid crystal layer

Andrade-Silva, Ignacio; Bortolozzo, U.; Castillo-Pinto, Camila; Clerc, Marcel G.; González-Cortés, Gregorio; Residori, Stefania; Wilson, Mario

doi:10.1098/rsta.2017.0382

Cited by 6 publications

(6 citation statements)

References 22 publications

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“…These fronts are characterized by being a circular spot that gathers in the center of the beam and spreads outwards and stops in the region where both states are energetically equivalent, Maxwell point. For intermediate light intensities, which do not induce isotropic liquid phase, the emergence of a pattern with a stripe shape has been reported [21,22]. In fact, these patterns correspond to regions that alternate higher and lower orientational molecular order.…”

Section: Introductionmentioning

confidence: 89%

“…The conventional phototropic transition detection is performed by sampling the excitation laser beam and extracting the reorientational order parameter with polarized optical microscopy [19][20][21][22][23]30]. The main inconvenience with those setups arises from the loss of information of the liquid crystal dynamics outside of the central Gaussian illuminated zone.…”

Section: Experimental Observations Of the Ring Patternsmentioning

confidence: 99%

“…We note that one of the reasons for considering methyl red methyl ester is that it is more miscible in E7 than other dopants; for example, methyl red. To describe the dynamics of the photo-isomerization process in the dye-doped nematic layer with planar anchoring, let us consider the concentration of molecules in the cis-state C( r ⊥ , t) and the scalar order parameter S( r ⊥ , t), which satisfy the dimensionless rate equations [21,22]…”

Section: Mathematical Modeling For Photo-isomerization In Dye-doped Liquid Crystalsmentioning

confidence: 99%

“…From this chart, we conclude that the system has a coexistence region between the nematic state and the pattern. Note that this pattern alternates between areas of higher and lower orientation order [21,22]. This affects the sample's refractive index; therefore, if a light beam passes through the sample in a patterned state, one expects to observe interference fringes.…”

Section: Light-induced Ring Patternmentioning

confidence: 99%

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Light-Induced Ring Pattern in a Dye-Doped Nematic Liquid Crystal

et al. 2021

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The use of dye-doped liquid crystals allows the amplification of the coupling of light and liquid crystals. Light can induce the self-organization of the molecular order. The appearance of ring patterns has been observed, which has been associated with phase modulation. However, the morphology and dynamics of the ring patterns are not consistent with self-modulation. Based on an experimental setup with two parallel coherence beams orthogonal to a liquid crystal cell, one of which induces photo-isomerization and the other causes illumination, the formation of ring patterns is studied. To use these two coherent beams, we synthesize methylred methyl ester as a dye-dopant, which is photosensitive only to one of the light beams, and a commercial E7 liquid crystal as a matrix. Based on a mathematical model that accounts for the coupling between the concentration of the cis-state and the order parameter, we elucidate the emergence of the rings as forming patterns in an inhomogeneous medium. The bifurcation diagram is analytically characterized. The emergence, propagation of the rings, and the establishment of the ring patterns are in fair agreement with the experimental observations.

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Section: Introductionmentioning

confidence: 89%

Section: Experimental Observations Of the Ring Patternsmentioning

confidence: 99%

Section: Mathematical Modeling For Photo-isomerization In Dye-doped Liquid Crystalsmentioning

confidence: 99%

Section: Light-induced Ring Patternmentioning

confidence: 99%

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Light-Induced Ring Pattern in a Dye-Doped Nematic Liquid Crystal

et al. 2021

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“…Optical pattern formation usually involves the combination of diffraction and nonlinearity in a Kerr medium. The second contribution [2] describes another mechanism by which light spontaneously induces dissipative structures in nematic states of dye-doped liquid crystal. The mechanism involves the photoisomerization process of the dopants.…”

mentioning

confidence: 99%

Dissipative structures in matter out of equilibrium: from chemistry, photonics and biology, the legacy of Ilya Prigogine (part 2)

Tlidi

Clerc

Panajotov

2018

Phil. Trans. R. Soc. A.

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Three-dimensional accurate modeling of nematic liquid crystal based dipole unit for reconfigurable reflectarray at 100 GHz

Geng

Song

2022

New J. Phys.

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In this paper, a three-dimensional accurate modeling of nematic liquid crystal has been presented for the analysis of reconfigurable reflectarray cells based on liquid crystal. Both single-dipole and multiple-dipoles constructed on a iquid crystal substrate are designed as the reflectarray unit cell. Considering the inhomogeneous and anisotropic effects, the orientation of the liquid crystal molecules at each point of the liquid crystal layer involved in the unit cell under the external electrostatic field is obtained by the finite difference numerical modeling method. Utilizing the accurate modeling results of liquid crystal, the reflection constants of the reflectarray unit cells have been simulated and also have been compared with that of in the conventional model which usually assumes the liquid crystal is homogeneous and isotropic. The error of phase range of the unit cell between the two models can exceed $45^{\circ}$ in the single-resonant unit cell, and is more than $290^{\circ}$ in the multi-resonant unit cell, which will seriously affect the practical application. The permittivity of liquid crystal in the unit cells under different applied voltages also has been calculated and given. Moreover, the gain radiation pattern of the reflectarray consisting of the proposed liquid crystal based double-dipoles is simulated in two models. The simulation results show that, in the accurate modeling, the gain and scanning angle range of the reflectarray obtained by the homogeneous and isotropic model change significantly because the phase-shift of the same unit cell for the incident wave is greatly different in the two models, which indicates that the homogeneous and isotropic model can no longer meet the needs of the design of liquid crystal based multi-dipoles reflectarray. Therefore, the accurate modeling method needs to be considered and can not be ignored when studying and designing liquid crystal based devices.

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Dissipative structures induced by photoisomerization in a dye-doped nematic liquid crystal layer

Abstract: One contribution of 12 to a theme issue 'Dissipative structures in matter out of equilibrium: from chemistry, photonics and biology (part 2)' .

Cited by 6 publications

References 22 publications

Light-Induced Ring Pattern in a Dye-Doped Nematic Liquid Crystal

Light-Induced Ring Pattern in a Dye-Doped Nematic Liquid Crystal

Dissipative structures in matter out of equilibrium: from chemistry, photonics and biology, the legacy of Ilya Prigogine (part 2)

Three-dimensional accurate modeling of nematic liquid crystal based dipole unit for reconfigurable reflectarray at 100 GHz

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