Anchoring effects on the electrically controlled optical band gap in twisted photonic liquid crystals
Anchoring effects on the electrically controlled optical band gap in twisted photonic liquid crystals
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DOI：
10.1080/02678292.2012.735706
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发表时间：
2013-01
期刊：
影响因子：
2.2
通讯作者：
C. Avendaño;I. Molina;J. A. Reyes
中科院分区：
文献类型：
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作者：
C. Avendaño;I. Molina;J. A. Reyes
研究了一维扭曲光子液晶（TPLC），该液晶由多个液晶盒组成，液晶盒采用扭曲结构，中间夹有各向同性介质层，外加直流电场（Edc）沿周期轴沿着排列.我们写相应的欧拉-拉格朗日方程描述的层配置。通过假设任意锚定准平面边界条件，我们计算的平衡纹理的ESTA，参数化的两种类型的强度的相互作用（极和方位角）与平面壁。我们将电磁方程写成4 × 4矩阵表示，并利用传输矩阵形式，得到了垂直入射时透射系数和反射系数随外电场和锚定强度的变化关系。我们已经观察到一个显着的电场上的透射和反射光谱打开和关闭带隙的依赖性。
We study a one-dimensional twisted photonic liquid crystal (TPLC), consisting of various nematic liquid crystal cells adopting a twisted configuration intercalated by isotropic dielectric layers, submitted to a dc electric field (Edc ) aligned along the periodicity axis. We write the corresponding Euler–Lagrange equations describing the nematic layer configuration. By assuming arbitrary anchoring quasi-planar boundary conditions, we calculate the equilibrium textures for the nematic, parametrized by the two types of strength of its interaction (polar and azimuthal) with the plane walls. We write the electromagnetic equations in a 4 × 4 matrix representation and using the transfer matrix formalism, we obtain the transmittance and reflectance coefficients for normal incidence as functions of the external electric field and anchoring strengths. We have observed a remarkable dependence of the electric field on the transmission and reflection spectra in opening and closing band gaps.