Highly sensitive refractive index sensor based on cladding mode interference in microtapered SMF

Saurabh Mani Tripathi; Arun Kumar; Emmanuel Marin; Jean-Pierre Meunier

doi:10.1117/12.886094

17 May 2011 Highly sensitive refractive index sensor based on cladding mode interference in microtapered SMF

Saurabh Mani Tripathi, Arun Kumar, Emmanuel Marin, Jean-Pierre Meunier

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77535C (2011) https://doi.org/10.1117/12.886094
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

A novel, highly sensitive refractive index sensor based on the modal interference in a microtapered telecom grade SMF is presented. The considered structure consists of a uniformly thinned region in between the tapered regions where the original core is virtually absent and the modes are supported by the cladding-ambient region index difference. The core mode evolution within the tapered region and its coupling to the cladding modes has been obtained using the localnormal- mode-matching. The proposed device has extremely high sensitivity ~ 2.6 μm/RIU for biological samples (n_se ~ 1.33) and hence should be useful for precision bio/chemical sensing applications.

Citation Download Citation

Saurabh Mani Tripathi, Arun Kumar, Emmanuel Marin, and Jean-Pierre Meunier "Highly sensitive refractive index sensor based on cladding mode interference in microtapered SMF", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77535C (17 May 2011); https://doi.org/10.1117/12.886094

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KEYWORDS

Cladding

Single mode fibers

Sensors

Refractive index

Biosensing

Brain-machine interfaces

Fiber Bragg gratings

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