Controlling light flow in the directed-assembly of blue-phase liquid crystal (BPLC) microspheres with curvature boundaries and random domain of cubic lattices is a highly interesting photonic phenomenon. A strategy of efficient random lasing with resonant feedback based on a microemulsion comprising of BPLC, laser dye and block copolymer is presented here. BPLCs are produced with a microfluidic apparatus and confined in microspheres. These spatially-assembled dye-doped BPLC microdroplets are used as a source for the generation of laser light. Recurrent light flow inside the droplets comprising of face-centered cubic blue-phase boundaries provides omnidirectional lasing with efficient coherent feedback which is not supported by conventional resonators. The topologically directed assemblies of BPLC microspheres with explicit shape and symmetry are essential for reducing threshold and increasing Q-factor of laser emission. These results provide new avenues for a wide range of photonic applications.

中文翻译：

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蓝相液晶微球拓扑定向组装中的高效随机激光

控制具有曲率边界和立方晶格随机域的蓝相液晶 (BPLC) 微球定向组装中的光流是一种非常有趣的光子现象。本文提出了一种基于由 BPLC、激光染料和嵌段共聚物组成的微乳液的具有共振反馈的高效随机激光发射策略。BPLC 是用微流体装置生产的，并被限制在微球中。这些空间组装的染料掺杂 BPLC 微滴用作产生激光的源。由面心立方蓝相边界组成的液滴内的循环光流提供具有有效相干反馈的全向激光，这是传统谐振器不支持的。具有明确形状和对称性的 BPLC 微球的拓扑定向组装对于降低激光发射的阈值和提高 Q 因子至关重要。这些结果为广泛的光子应用提供了新的途径。