Control of Randomness in Microsphere-Based Photonic Crystals Assembled by Langmuir–Blodgett Process,Langmuir

当前位置： X-MOL 学术 › Langmuir › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Control of Randomness in Microsphere-Based Photonic Crystals Assembled by Langmuir–Blodgett Process
Langmuir ( IF 3.7 ) Pub Date : 2017-11-21 00:00:00 , DOI: 10.1021/acs.langmuir.7b03060
Sarun Atiganyanun ₁ , Mi Zhou ₁ , Omar K. Abudayyeh ₂ , Sang M. Han _{1,

2} , Sang Eon Han _{1,

2}

Affiliation

Photonic structures in biological systems typically exhibit an appreciable level of disorder within their periodic framework. However, how such disorder within the ordered framework renders unique optical properties has not been fully understood. Toward the goal of improving this understanding, we have investigated Langmuir–Blodgett assembly of microspheres to controllably introduce randomness to photonic structures. We theoretically modeled the assembly process and determined a condition for surface pressure and substrate pulling speed that results in maximum structural order. For each surface pressure, there is an optimum pulling speed and vice versa. Along the trajectory defined by the optimum condition, however, the structural order decreases moderately as the pulling speed increases. This moderate decrease in structural order would be useful for controlled introduction of randomness into the periodic structures. Departing from the trajectory, our experiment reveals that a small change in pulling speed at a given surface pressure can significantly disrupt the structural order. For multilayer assembly, we find that, at a fixed pulling speed, the surface pressure should increase as the number of layers increases to achieve maximum structural order. In totality, we quantitatively present the optimum trajectories for the nth layer assembly relating surface pressure and pulling speed.

中文翻译：

Langmuir-Blodgett过程组装的基于微球的光子晶体的随机性控制

生物系统中的光子结构通常在其周期性框架内表现出一定程度的混乱。然而，尚未完全理解有序框架内的这种无序如何赋予独特的光学性质。为了提高这种认识的目标，我们研究了Langmuir-Blodgett微球组装，以可控制地将随机性引入光子结构。我们在理论上对组装过程进行了建模，并确定了导致最大结构顺序的表面压力和基材拉动速度的条件。对于每个表面压力，都有一个最佳的牵引速度，反之亦然。但是，沿着最佳条件定义的轨迹，随着拉速的增加，结构顺序会适度降低。结构顺序的这种适度下降对于将随机性控制地引入周期性结构将是有用的。从轨迹出发，我们的实验表明，在给定的表面压力下，拉速的微小变化会显着破坏结构顺序。对于多层组件，我们发现，在固定的拉速下，表面压力应随着层数的增加而增加，以实现最大的结构顺序。总的来说，我们定量地给出了最优轨迹。表面压力应随着层数的增加而增加，以实现最大的结构顺序。总的来说，我们定量地给出了最优轨迹。表面压力应随着层数的增加而增加，以实现最大的结构顺序。总的来说，我们定量地给出了最优轨迹。第n层组件涉及表面压力和拉动速度。

更新日期：2017-11-21

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11