Thermal optical non-linearity of nematic mesophase enhanced by gold nanoparticles--an experimental and numerical investigation.
Thermal optical non-linearity of nematic mesophase enhanced by gold nanoparticles--an experimental and numerical investigation.
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DOI：
10.1039/c6cp00116e
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发表时间：
2016-04
期刊：
影响因子：
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通讯作者：
O. Kurochkin;Y. Murugesan;Thomas P. Bennett;G. D’Alessandro;Yuri Reznikov;Baijia J. Tang;G. Mehl;Malgosia Kaczmarek
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文献类型：
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作者：
O. Kurochkin;Y. Murugesan;Thomas P. Bennett;G. D’Alessandro;Yuri Reznikov;Baijia J. Tang;G. Mehl;Malgosia Kaczmarek
在这项工作中，研究了通过在液晶（LC）中掺杂金纳米颗粒（GNP）进行局部加热来增强向列液晶材料的光学非线性的机制。我们提出了一些关于电压和纳米颗粒浓度对 GNP-LC 悬浮液非线性响应影响的实验和理论结果。这些系统的光学非线性通过衍射测量来表征，并且使用二阶非线性折射率 n2 来比较具有不同配置和工作条件的系统。开发并验证了基于热扩散的理论模型，该模型考虑了入射光束的强度和有限尺寸、GNP 掺杂液晶系统的纳米粒子浓度依赖性吸光度以及边界基板的存在。我们使用该模型来讨论进一步增强光学非线性的可能性。
In this work the mechanisms leading to the enhancement of optical nonlinearity of nematic liquid crystalline material through localized heating by doping the liquid crystals (LCs) with gold nanoparticles (GNPs) are investigated. We present some experimental and theoretical results on the effect of voltage and nanoparticle concentration on the nonlinear response of GNP-LC suspensions. The optical nonlinearity of these systems is characterized by diffraction measurements and the second order nonlinear refractive index, n2, is used to compare systems with different configurations and operating conditions. A theoretical model based on heat diffusion that takes into account the intensity and finite size of the incident beam, the nanoparticle concentration dependent absorbance of GNP doped LC systems and the presence of bounding substrates is developed and validated. We use the model to discuss the possibilities of further enhancing the optical nonlinearity.