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Title: Birefringence induced Vernier effect in optical fiber modal interferometers for enhanced sensing
Authors: Li, Kaiwei
Zhang, Nan
Zhang, Nancy Meng Ying
Zhou, Wenchao
Zhang, Ting
Chen, Ming
Wei, Lei
Keywords: Engineering::Electrical and electronic engineering
Optical Fiber Sensors
Optical Microfiber Couplers
Issue Date: 2018
Source: Li, K., Zhang, N., Zhang, N. M. Y., Zhou, W., Zhang, T., Chen, M., & Wei, L. (2018). Birefringence induced Vernier effect in optical fiber modal interferometers for enhanced sensing. Sensors and Actuators B: Chemical, 27516-24. doi:10.1016/j.snb.2018.08.027
Series/Report no.: Sensors and Actuators B: Chemical
Abstract: We report a simple and effective method to improve the sensitivities of fiber-optic modal interferometers with birefringence induced Vernier effect. Taking optical microfiber coupler as an example, we study the sensitivity enhancement of a microfiber coupler for refractive index (RI) sensing both theoretically and experimentally in the RI range of 1.33–1.35 where bioassays are typically carried out. Numerical results show that by tracing the wavelength shifts of dips in the envelope formed by the Vernier effect, RI sensitivities can be improved by almost one order of magnitude compared to the sensors without the Vernier effect. Then we experimentally achieve an ultra-high sensitivity of 35,823.3 nm/RIU using a microfiber coupler with a width of 3.2 μm. More importantly, we apply this ultra-sensitive sensor to detect human cardiac troponin, and a limit of detection of 1 ng/mL is achieved. This sensor is simple in configuration andcan serve as a bio-photonic platform for clinical diagnostics environmental monitoring and food safety.
ISSN: 0925-4005
DOI: 10.1016/j.snb.2018.08.027
Schools: School of Electrical and Electronic Engineering 
Research Centres: Research Techno Plaza 
Rights: © 2018 Elsevier. All rights reserved. This paper was published in Sensors and Actuators B: Chemical and is made available with permission of Elsevier.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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