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Volume 13
Issue 10
10.3390/s131014055
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Communication

Highly Sensitive Refractive Index Sensor Based on Adiabatically Tapered Microfiber Long Period Gratings

by
Wen Bin Ji
1,*,
Swee Chuan Tjin
1,
Bo Lin
2 and
Choong Leng Ng
1
1
School of Electrical and Electronic Engineering, Optimus, Nanyang Technological University, Singapore 639798, Singapore
2
Institute for Infocomm Research, 1 Fusionopolis Way, #21-01 Connexis, Singapore 138632, Singapore
*
Author to whom correspondence should be addressed.
Sensors 2013, 13(10), 14055-14063; https://doi.org/10.3390/s131014055
Submission received: 23 July 2013 / Accepted: 9 October 2013 / Published: 17 October 2013
(This article belongs to the Special Issue Photonic Sensors for Industrial, Environmental and Health Monitoring)
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Abstract

We demonstrate a refractive index sensor based on a long period grating (LPG) inscribed in a special photosensitive microfiber with double-clad profile. The fiber is tapered gradually enough to ensure the adiabaticity of the fiber taper. In other words, the resulting insertion loss is sufficiently small. The boron and germanium co-doped inner cladding makes it suitable for inscribing gratings into its tapered form. The manner of wavelength shift for refractive indices (RIs) differs from conventional LPG, and the refractive index detection limit is 1.67 × 10−5.
Keywords: long period gratings; microfiber; refractive index sensor; adiabatic taper long period gratings; microfiber; refractive index sensor; adiabatic taper

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MDPI and ACS Style

Ji, W.B.; Tjin, S.C.; Lin, B.; Ng, C.L. Highly Sensitive Refractive Index Sensor Based on Adiabatically Tapered Microfiber Long Period Gratings. Sensors 2013, 13, 14055-14063. https://doi.org/10.3390/s131014055

AMA Style

Ji WB, Tjin SC, Lin B, Ng CL. Highly Sensitive Refractive Index Sensor Based on Adiabatically Tapered Microfiber Long Period Gratings. Sensors. 2013; 13(10):14055-14063. https://doi.org/10.3390/s131014055

Chicago/Turabian Style

Ji, Wen Bin, Swee Chuan Tjin, Bo Lin, and Choong Leng Ng. 2013. "Highly Sensitive Refractive Index Sensor Based on Adiabatically Tapered Microfiber Long Period Gratings" Sensors 13, no. 10: 14055-14063. https://doi.org/10.3390/s131014055

APA Style

Ji, W. B., Tjin, S. C., Lin, B., & Ng, C. L. (2013). Highly Sensitive Refractive Index Sensor Based on Adiabatically Tapered Microfiber Long Period Gratings. Sensors, 13(10), 14055-14063. https://doi.org/10.3390/s131014055

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