title: Controlled assembly of organic whispering-gallery-mode microlasers as highly sensitive chemical vapor sensors.
abstract: We demonstrate the fabrication of organic high Q active whispering-gallery-mode (WGM) resonators from π-conjugated polymer by a controlled emulsion-solvent-evaporation method, which can simultaneously provide optical gain and act as an effective resonant cavity. By measuring the shift of their lasing modes on exposure to organic vapor, we successfully monitored the slight concentration variation in the chemical gas. These microlaser sensors demonstrated high detection sensitivity and good signal repeatability under continuous chemical gas treatments. The results offer an effective strategy to design miniaturized optical sensors.
authors.affiliation: College of Chemistry, Beijing Normal University, Beijing 100875, China. fqhu@bnu.edu.cn.
authors.forename: Miaomiao
authors.initials: M
authors.lastname: Gao
authors.affiliation: Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. yszhao@iccas.ac.cn.
authors.forename: Cong
authors.initials: C
authors.lastname: Wei
authors.affiliation: Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. yszhao@iccas.ac.cn.
authors.forename: Xianqing
authors.initials: X
authors.lastname: Lin
authors.affiliation: College of Chemistry, Beijing Normal University, Beijing 100875, China. fqhu@bnu.edu.cn.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: College of Chemistry, Beijing Normal University, Beijing 100875, China. fqhu@bnu.edu.cn.
authors.forename: Fengqin
authors.initials: F
authors.lastname: Hu
authors.affiliation: Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. yszhao@iccas.ac.cn.
authors.forename: Yong Sheng
authors.identifier: http://orcid.org/0000-0002-4329-0103
authors.initials: YS
authors.lastname: Zhao