Compact and cost-effective temperature-insensitive bio-sensor based on long-period fiber gratings for accurate detection of E-coli bacteria in water

被引：45
|
作者：
Dandapat, Krishnendu [1 ]
Tripathi, Saurabh Mani [1 ]
Chinifooroshan, Yasser [2 ]
Bock, Wojtek J. [2 ]
Mikulic, Predrag [2 ]
机构：
[1] Indian Inst Technol, Dept Phys, Kanpur 208016, Uttar Pradesh, India
[2] Univ Quebec Outaouais, Dept Comp Sci & Engn, Photon Res Ctr, Gatineau, PQ J8Y 3G5, Canada
来源：
OPTICS LETTERS | 2016年 / 41卷 / 18期
基金：
加拿大自然科学与工程研究理事会;
关键词：
SIMULTANEOUS REFRACTIVE-INDEX; BIOSENSORS;
D O I：
10.1364/OL.41.004198
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We propose and demonstrate a novel temperature-insensitive bio-sensor for accurate and quantitative detection of Escherichia coli (E. coli) bacteria in water. Surface sensitivity is maximized by operating the long-period fiber grating (LPFG) closest to its turnaround wavelength, and the temperature insensitivity is achieved by selectively exciting a pair of cladding modes with opposite dispersion characteristics. Our sensor shows a nominal temperature sensitivity of similar to 1.25 pm/degrees C, which can be further reduced by properly adjusting the LPFG lengths, while maintaining a high refractive index sensitivity of 1929 nm/RIU. The overall length of the sensor is similar to 3.6 cm, making it ideally suitable for bio-sensing applications. As an example, we also show the sensor's capability for reliable, quantitative detection of E. coli bacteria in water over a temperature fluctuation of room temperature to 40 degrees C. (C) 2016 Optical Society of America
引用
收藏
页码：4198 / 4201
页数：4
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