Magnetic Nanoparticle-Assisted Tunable Optical Patterns from Spherical Cholesteric Liquid Crystal Bragg Reflectors.
Magnetic Nanoparticle-Assisted Tunable Optical Patterns from Spherical Cholesteric Liquid Crystal Bragg Reflectors.
复制标题
球形胆甾型液晶布拉格反射器的磁性纳米颗粒辅助可调谐光学图案
DOI：
10.3390/nano7110376
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发表时间：
2017-11-08
期刊：
影响因子：
--
通讯作者：
Chen L
中科院分区：
文献类型：
--
作者：
Lin Y;Yang Y;Shan Y;Gong L;Chen J;Li S;Chen L
胆甾相液晶（CLC）由于其自发自组装成周期性螺旋结构的能力而表现出对圆偏振光（CP）的选择性布拉格反射。利用球形液晶结构可以产生具有潜在安全应用价值的光子交叉通信图案。为了赋予这些光学图案的可调谐性，我们制作了球形CLC布拉格反射器的形状的微壳玻璃毛细管微流体。水溶性磁流体与Fe3O4纳米粒子纳入内的CLC壳水核心是负责的非侵入性运输能力。借助外磁场，通过改变一组可磁性传输和不可移动的球形CLC结构的相互距离，确定了相邻微壳和微滴之间的反射相互作用.研究了七个具有反螺旋旋向性的CLC微滴和微壳的密排六边形排列中随温度变化的光学反射图案。此外，我们证明了磁场辅助组装的微壳阵列成几何图形的两个英文字母“L”和“C”成功地实现。我们希望这些发现可以为安全模式设计提供良好的应用前景。
Cholesteric liquid crystals (CLCs) exhibit selective Bragg reflections of circularly polarized (CP) light owing to their spontaneous self-assembly abilities into periodic helical structures. Photonic cross-communication patterns could be generated toward potential security applications by spherical cholesteric liquid crystal (CLC) structures. To endow these optical patterns with tunability, we fabricated spherical CLC Bragg reflectors in the shape of microshells by glass-capillary microfluidics. Water-soluble magnetofluid with Fe3O4 nanoparticles incorporated in the inner aqueous core of CLC shells is responsible for the non-invasive transportable capability. With the aid of an external magnetic field, the reflection interactions between neighboring microshells and microdroplets were identified by varying the mutual distance in a group of magnetically transportable and unmovable spherical CLC structures. The temperature-dependent optical reflection patterns were investigated in close-packed hexagonal arrangements of seven CLC microdroplets and microshells with inverse helicity handedness. Moreover, we demonstrated that the magnetic field-assisted assembly of microshells array into geometric figures of uppercase English letters “L” and “C” was successfully achieved. We hope that these findings can provide good application prospects for security pattern designs.
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影响因子：
4.6
作者：
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通讯作者：
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作者：
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