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Random and distributed feedback laser action using spontaneous liquid crystal-liquid crystal nano-scale phase separation

利用自发液晶-液晶纳米级相分离的随机和分布式反馈激光作用

基本信息

批准号：
23656016
负责人：
TAKANISHI Yoichi
金额：
$ 2.25万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Challenging Exploratory Research
财政年份：
2011
资助国家：
日本
起止时间：
2011 至 2012
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23656016/
关键词：
液晶フォトニクスナノ複合構造

项目摘要

The purpose of this study is to fabricate the nano-scale phase separated structure in the cholesteric liquid crystal -bent-core liquid crystal binary system, and to attain the combination of random laser mode and distributed feedback laser mode. Furthermore, gold nanoparticles are dispersed in this system, and we aimed the combination with surface plasmonic effect.At first, it was found that chiral molecules contained in the cholesteric phase was macroscopically phase separated by small-angle X-ray scattering. To overcome this problem, we tried to find the best condition to make the nano-scale phase separated structure by changing the cooling rate etc, but it was not successful to fabricate the such a structure exhibiting the good photonic band. For the coherent back scattering measurement system, At the same time, we modified the decan-thiol to gold nano-particle, and check whether particles are accumulated in the lower orientational order region of nematic phase. Unexpectedly, the particles are accumulated in the higher orientational order region. Under the study, on the other hand, we fabricated the CLC shells as a wate-in-oil-in-water (W/O/W) double emulsion using a microfluidic device. The oil phase of the W/O/W emulsion is made up of a CLC phase. The photonic structure in the CLC shellis confirmed by the spatial mapping of fluorescence emission spectra of a dye dissolved in the aqueous core region with a two-dimensional imaging spectrometer. The curious lasing characteristics in the CLC shell are also presented.

本研究的目的是在胆甾型液晶-弯核液晶二元体系中制备纳米级相分离结构，实现随机激光模式与分布反馈激光模式的结合。此外，金纳米粒子分散在该体系中，并与表面等离子体效应相结合。首先，通过x射线小角散射发现胆甾相中所含的手性分子被宏观相分离。为了克服这一问题，我们试图通过改变冷却速度等方法来寻找制备纳米级相分离结构的最佳条件，但未能成功制备出具有良好光子带的纳米相分离结构。在相干后向散射测量系统中，我们将十硫醇修饰为金纳米粒子，并检测粒子是否在向列相的低取向阶区积累。出乎意料的是，粒子聚集在高取向阶区域。另一方面，我们利用微流控装置将CLC壳制成油包水（W/O/W）双乳液。W/O/W乳液的油相由CLC相组成。利用二维成像光谱仪对溶解在水核区的染料的荧光发射光谱进行空间映射，确定了CLC壳层的光子结构。本文还介绍了CLC壳体奇特的激光特性。