Two-colour soliton interactions in nematic liquid crystals with temperature-dependent reorientational response

IF 2.1 3区物理与天体物理 Q2 ACOUSTICS

Wave Motion Pub Date : 2025-02-14 DOI:10.1016/j.wavemoti.2025.103512

Gaetano Assanto , Cassandra Khan , Timothy R. Marchant , Noel F. Smyth , Rosa Maria Vargas-Magaña

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引用次数: 0

Abstract

The propagation and interaction of two optical spatial solitons, termed Nematicons, at different wavelengths in (2+1) dimensions is investigated in nematic liquid crystals exhibiting competing nonlinearities. In such soft matter the all-optical refractive index nonlocal response to extraordinarily polarized beams can be self-focusing via induced rotation of the constituent molecules and self-defocusing due to temperature increase mediated by photon absorption.

We consider wave-packets with initially straight trajectories either converging towards or diverging away from each other. The beams can converge or diverge depending on their transverse velocities at the input and other system parameters. We derive approximate variational solutions, finding that nematicons attract within a V-shaped region in the parameter space defined by their initial velocity and the defocusing coefficient. Comparisons between the approximate and full numerical solutions show an excellent agreement for initially diverging nematicons.

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具有温度依赖重定向响应的向列液晶中的双色孤子相互作用

研究了两个不同波长向列子在（2+1）维的向列液晶中的传播和相互作用。在这种软物质中，对超偏振光束的全光折射率非局部响应可以通过诱导组成分子的旋转而自聚焦，并且由于光子吸收介导的温度升高而自散焦。我们考虑具有初始直线轨迹的波包，它们要么彼此收敛，要么彼此发散。光束可以收敛或发散取决于它们在输入处的横向速度和其他系统参数。我们导出了近似变分解，发现在由初始速度和离焦系数定义的参数空间中，向列在一个v形区域内相互吸引。近似解与全数值解的比较表明，初始发散向列矩阵具有很好的一致性。

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来源期刊

Wave Motion 物理-力学

CiteScore

4.10

自引率

8.30%

发文量

118

审稿时长

3 months

期刊介绍： Wave Motion is devoted to the cross fertilization of ideas, and to stimulating interaction between workers in various research areas in which wave propagation phenomena play a dominant role. The description and analysis of wave propagation phenomena provides a unifying thread connecting diverse areas of engineering and the physical sciences such as acoustics, optics, geophysics, seismology, electromagnetic theory, solid and fluid mechanics. The journal publishes papers on analytical, numerical and experimental methods. Papers that address fundamentally new topics in wave phenomena or develop wave propagation methods for solving direct and inverse problems are of interest to the journal.