Random Lasing in Novel Dye-Doped White Paints with Shape Memory
Random Lasing in Novel Dye-Doped White Paints with Shape Memory
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DOI：
10.1002/adom.201500128
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发表时间：
2015-08-01
影响因子：
9
通讯作者：
Lopez, Cefe
中科院分区：
文献类型：
--
作者：
Espinha, Andre;Concepcion Serrano, Maria;Lopez, Cefe
虽然使用形状记忆聚合物（SMP）及其衍生复合材料实现了巨大的进步，但这些介质在光学和光子学中的应用仍然局限于少数系统。目前的工作解决了基于掺杂二氧化钛纳米粒子的聚二醇柠檬酸酯的新型复合材料的制造和表征，旨在扩大原始弹性体的能力。它们构成了先进的光子白色涂料，其中包含形状记忆效应作为附加功能。在这些材料中，光传播是漫射的，并且可以通过作用于二氧化钛填料浓度来定制其传输平均自由程。光学增益引入额外掺杂的有机染料的复合材料。这允许通过发光来监测形状恢复过程，并且相反地，复合材料可以作为可配置的形状活性介质来执行。系统的光致发光研究证明了它们在非共振反馈随机激光器中的应用。受激发射的阈值取决于填料和染料的浓度。这样获得的多功能复合材料是有前途的候选人之间建立协同作用的应用领域的SMP与那些通常限于随机光子介质，导致新的自报告传感器/致动器或响应照明设备，例如。
Although enormous advances are accomplished using shape memory polymers (SMPs) and their derived composites, the application of these media in optics and photonics is still restricted to a few systems. The present work addresses the fabrication and characterization of novel composites based on polydiolcitrates doped with titania nanoparticles, aiming at expanding the capabilities of the original elastomer. They constitute advanced photonic white paints, which incorporate the shape memory effect as an additional functionality. In these materials, light propagation is diffusive and it is possible to tailor its transport mean free path by acting on the titania fillers concentration. Optical gain is introduced by additionally doping the composites with organic dyes. This allows the shape recovery process to be monitored by luminescence and, conversely, the composites can perform as configurable shape active media. Their application in nonresonant feedback random lasers is demonstrated by systematic photoluminescence studies. The threshold for stimulated emission is shown to depend on both the fillers and dye concentrations. The so-obtained multifunctional composites are promising candidates for establishing synergies between applications from the domain of SMPs with those typically restricted to random photonic media, leading to novel self-reporting sensors/actuators or responsive illumination devices, for example.