基于时域有限差分法的液晶光学特性模拟  被引量:8

Optical Property Simulation of Liquid Crystal Based on Finite-Difference Time-Domain Method

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作  者:方运[1] 张健[1] 吴丽莹[1] 

机构地区:[1]哈尔滨工业大学超精密光电仪器工程研究所,黑龙江哈尔滨150001

出  处:《光学学报》2010年第2期562-566,共5页Acta Optica Sinica

基  金:国家自然科学基金(60878048)资助课题

摘  要:研究了模拟光在液晶中传播的时域有限差分(FDTD)法。该方法采用完全匹配层吸收边界条件来截断计算区域,通过独立计算总场区域与散射场区域的左连接边界和右连接边界上的入射场场值来实现非周期结构的平面波波源引入,并提出了分裂场一维辅助FDTD方法来计算含有非均匀各向异性介质的边界上的入射场场值。实现了平面波源入射下具有非周期结构的液晶器件光学特性计算。对开态下扭曲向列相液晶盒的仿真结果表明,30°入射时散射区透射率的最大泄漏误差小于3%,可知该方法对非周期、非均匀各向异性介质光学特性分析是有效的。Finite-difference time-domain (FDTD) method is used to simulate the light propagation through liquid crystals. The computation window is truncated by the perfectly matched layer absorbing boundary conditions. The incident fields on left connecting boundary and right connecting boundary between total-field region and scattered-field region are calculated independently to introduce plane wave for non-periodic structures. A split-field 1-D auxiliary FDTD method is proposed to calculate incident fields on those boundaries,where the medium are inhomogeneous and anisotropic. Combined these techniques together,plane waves are applicable for non-periodic liquid crystal devices. The simulation results show that the maximum leakage of transmissivity into scattered-field region is less than 3% for twisted nematic cell in on state at 30° incidence. The approach is proved effective for the analysis of optical properties of non-periodic inhomogeneous anisotropic medium.

关 键 词:液晶光学 非周期结构 时域有限差分法 总场/散射场技术 

分 类 号:O753.2[理学—晶体学]

 

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