Ultrasensitive label-free coupled optofluidic ring laser sensor

被引：36
|
作者：
Ren, Liqiang [1 ]
Wu, Xiang [1 ]
Li, Ming [1 ]
Zhang, Xingwang [1 ]
Liu, Liying [1 ]
Xu, Lei [1 ]
机构：
[1] Fudan Univ, Sch Informat Sci & Engn, Dept Opt Sci & Engn, Key Lab Micro & Nanophoton Struct,Minist Educ, Shanghai 200433, Peoples R China
来源：
OPTICS LETTERS | 2012年 / 37卷 / 18期
基金：
中国国家自然科学基金; 上海市自然科学基金;
关键词：
RESONATOR SENSORS;
D O I：
10.1364/OL.37.003873
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A coupled optofluidic ring laser sensor is fabricated, and its ultrasensitive bulk refractive index and surface mass sensing properties are demonstrated. The sensor consists of a cylindrical ring laser and a thin-walled optofluidic capillary ring resonator. Coupling of the whispering gallery mode in the two resonators generates a largely magnified sensitivity due to the Vernier effect. A sensitivity of 2510 nm/RIU and magnification factor of 355 are achieved experimentally in aqueous solution, which corresponds to a noise equivalent detection limit of 1.6 x 10(-5) RIU for bulk RI detection. The new sensor configuration provides a convenient way to achieve ultrasensitive biological and chemical sensing. (C) 2012 Optical Society of America
引用
收藏
页码：3873 / 3875
页数：3
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