Shrinkage of Cholesteric Liquid Crystalline Microcapsule as Omnidirectional Cavity to Suppress Optical Loss,Advanced Optical Materials

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Shrinkage of Cholesteric Liquid Crystalline Microcapsule as Omnidirectional Cavity to Suppress Optical Loss
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-01-07 , DOI: 10.1002/adom.201901363
Yosuke Iwai ₁ , Ryosuke Iijima ₁ , Kaho Yamamoto ₁ , Takuya Akita ₁ , Yoshiaki Uchida ₁ , Norikazu Nishiyama ₁

Affiliation

Cholesteric liquid crystalline (CLC) emulsions are the easiest 3D omnidirectional laser resonators to fabricate. To exploit the full potential of CLC emulsions as distributed Bragg reflection (DBR) mode laser resonators, monodispersed water‐in‐CLC‐in‐water double emulsions (CLC microcapsules) have higher performance scalability than simple CLC droplets. If laser dyes are concentrated at the center of CLC microcapsules, emitted light from the dye is 3D confined. When water is squeezed from the inner phase of a CLC microcapsule comprising an aqueous laser dye solution by means of osmotic pressure difference from the outer phase, the DBR lasing threshold of the CLC microcapsule is reduced. The shrinkage of the inner droplet contributes not only the simple reduction of the cavity length but also the suppression of the optical loss to reduce the lasing threshold. The reduced optical loss is beneficial to realize various devices: optical manipulation, photonic cross communications, and biochemical, light, and temperature sensing. Their flexible photonic structures are suitable for emerging and future optical devices like wearable optical devices.

中文翻译：

收缩胆甾型液晶微囊作为全向腔以抑制光损耗

胆甾型液晶（CLC）乳液是最容易制造的3D全向激光谐振器。为了充分利用CLC乳剂作为分布式布拉格反射（DBR）模式激光谐振器的潜力，单分散的CLC-水包水双重乳剂（CLC微胶囊）具有比简单CLC液滴更高的性能可扩展性。如果激光染料集中在CLC微囊的中心，则染料发出的光将受到3D限制。当通过与外相的渗透压差将水从包含激光染料水溶液的CLC微囊的内相中挤压出来时，CLC微囊的DBR激射阈值降低。内部液滴的收缩不仅有助于腔长度的简单减小，而且还有助于抑制光学损失以减小激光阈值。减少的光损耗有利于实现各种设备：光学操作，光子交叉通信以及生化，光和温度感测。它们的柔性光子结构适合新兴和未来的光学设备（如可穿戴光学设备）。

更新日期：2020-03-20

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