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Liquid Crystals Volume 47, 2020 - Issue 4
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Original Articles

A three-layer egg-configurated Bragg microcavity of polyglycerol coated cholesteric-liquid-crystal encapsulated by hollow-glass-microsphere

Jianyang HuKey Lab of In-fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin, ChinaView further author information
,
Dongying FuKey Lab of In-fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin, ChinaView further author information
,
Chunli XiaKey Lab of In-fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin, ChinaView further author information
,
Chi ZhangKey Lab of In-fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin, ChinaView further author information
,
Lishuang YaoState Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, China;Department of Physics, College of Science, Shantou University, Shantou, ChinaView further author information
,
Chunlian LuKey Lab of In-fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin, ChinaView further author information
,
Weimin SunKey Lab of In-fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin, ChinaView further author information
&
Yongjun LiuKey Lab of In-fiber Integrated Optics, Ministry Education of China, Harbin Engineering University, Harbin, China;State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, ChinaCorrespondence[email protected]
View further author information
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Pages 508-515 | Received 09 Jul 2019, Accepted 22 Aug 2019, Published online: 03 Sep 2019
 
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ABSTRACT

This letter reports the optical pumped lasing behaviours of a three-layer Bragg resonance cavity consisting of dye-doped cholesteric liquid crystal (DDCLC) microdroplet, polyglycerol-2 and hollow glass microsphere. The function of PG2 is to control the parallel anchoring of the liquid crystal (LC) molecules on the surface of the LC microdroplet. The whispering-gallery mode (WGM), radial Bragg (photonic bandgap, PBG) mode and Bragg WGM (BWGM) are observed in DDCLC microspheres with different helical pitches and LC refractive indices. The formation mechanisms of six types of lasing emission conditions are analysed in detail. The study results present the prospect of controlling the output mode of the laser. Furthermore, such solid shell-based DDCLC microspheres have outstanding potential applications in miniaturised 3D Bragg lasers, sensors, and integrated and tunable optical devices.

GRAPHICAL ABSTRACT

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was financially supported by the National Science Foundation of China (Grant No.U1531102, 11603008, 61107059), and the Fundamental Research Funds for the Central Universities (HEUCF181116).

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