This study performs a detailed theoretical analysis of refractive index (RI) sensors based on whispering gallery modes (WGMs) in liquid core optical ring resonators (LCORRs). Both TE- and TM-polarized WGMs of various orders are considered. The analysis shows that WGMs of higher orders need thicker walls to achieve a near-zero thermal drift, but WGMs of different orders exhibit a similar RI sensing performance at the thermostable wall thicknesses. The RI detection limit is very low at the thermo stable thickness. The theoretical predications should provide a general guidance in the development of LCORR-based thermostable RI sensors.
© 2011 Optical Society of America
Lasers and Laser Optics
Original Manuscript: March 31, 2011
Revised Manuscript: May 28, 2011
Manuscript Accepted: May 28, 2011
Published: July 7, 2011
Nai Lin, Lan Jiang, Sumei Wang, Hai Xiao, Yongfeng Lu, and Hai-Lung Tsai, "Design and optimization of liquid core optical ring resonator for refractive index sensing," Appl. Opt. 50, 3615-3621 (2011)