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Shrinkage of Cholesteric Liquid Crystalline Microcapsule as Omnidirectional Cavity to Suppress Optical Loss
Author(s) -
Iwai Yosuke,
Iijima Ryosuke,
Yamamoto Kaho,
Akita Takuya,
Uchida Yoshiaki,
Nishiyama Norikazu
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201901363
Subject(s) - materials science , lasing threshold , optoelectronics , laser , resonator , shrinkage , dye laser , phase (matter) , cholesteric liquid crystal , optics , photonics , optical cavity , liquid crystal , composite material , wavelength , chemistry , physics , organic chemistry
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.