Open AccessCoupled optofluidic ring laser for ultrahigh- sensitive sensing
Author(s) -
Qizhou Zhang,
Liqiang Ren,
Xiang Wu,
Hao Li,
Liying Liu,
Lei Xu
Publication year - 2011
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.022242
Subject(s) - whispering gallery wave , lasing threshold , materials science , whispering gallery , optics , laser , ring laser , resonator , ring (chemistry) , optoelectronics , sensitivity (control systems) , resonance (particle physics) , multi mode optical fiber , wavelength , optical fiber , physics , chemistry , organic chemistry , electronic engineering , engineering , particle physics
Ultrahigh sensitivity is achieved in a new active sensor structure: coupled optofluidic ring laser. The sensor consists of one ring laser and one optofluidic tube. The emission intensity of the multimode whispering gallery resonance from the coupled ring laser is strongly modulated. By using the optofluidic tube as the sensing element, and monitoring the envelope shift of the modulated lasing spectrum, we achieved a sensitivity of 5930 nm/RIU, which is two orders of magnitude higher than a conventional ring resonator sensor.