Chinese Optics Letters, 2018, 16 (8): 081401, Published Online: Aug. 2, 2018
Whispering-gallery mode lasing from polymer microsphere for humidity sensing Download: 862次
Abstract
Microlasers based on high quality (Q ) whispering-gallery mode (WGM) resonance are promising low threshold laser sources for bio-sensing and imaging applications. In this Letter, dye-doped polymer microspheres were fabricated by a controlling emulsion solvent evaporation method. WGM lasing with low threshold and high Q factors was realized in an individual microsphere under femtosecond laser pumping. The slight change of environmental relative humidity (RH) can be monitored by measuring the shift of the lasing modes at the exposure of water molecules, which demonstrates the sensitivity is as high as 6 pm/RH%. The results would offer an insight into employing microlasers as sensors.
Wei Xu, Chunxiang Xu, Feifei Qin, Yaqi Shan, Zhu Zhu, Ye Zhu. Whispering-gallery mode lasing from polymer microsphere for humidity sensing[J]. Chinese Optics Letters, 2018, 16(8): 081401.