We propose a dynamic operational mode and the resulting dynamic line narrowing as a method for enhancing the resolution and the detection limit of high-quality (high-Q) resonant optical sensors. Using a silica microtoroid as an experimental platform, we demonstrate that dynamic line narrowing through the thermo-optic effect can significantly improve the detection limit in both resonant shift and resonance splitting operating modes.
© 2011 Optical Society of America
Original Manuscript: August 3, 2011
Manuscript Accepted: October 3, 2011
Published: November 15, 2011
Vol. 7, Iss. 1 Virtual Journal for Biomedical Optics
Fenfei Liu, Shoufeng Lan, and Mani Hossein-Zadeh, "Application of dynamic line narrowing in resonant optical sensing," Opt. Lett. 36, 4395-4397 (2011)