Evanescent wave sensor based on permanently bent single mode optical fiber

A novel refractive index sensing scheme based on evanescent wave interaction through locally and permanently bent single mode optical fibers is proposed. Local and permanent bends in single mode optical fibers enable significant power coupling between core and cladding modes. Order and number of exc...

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Published inSensors and actuators. B, Chemical Vol. 155; no. 2; pp. 903 - 908
Main Authors Iadicicco, A., Paladino, D., Campopiano, S., Bock, W.J., Cutolo, A., Cusano, A.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 20.07.2011
Subjects
Bends
Cladding
Detection
Evanescent wave sensor
Evanescent waves
In-fiber sensor
Mode coupling
Optical fibers
Permanently bent fiber
Refractive index
Refractivity
Sensors
In-fiber sensor
Mode coupling
Evanescent wave sensor
Permanently bent fiber
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Summary:A novel refractive index sensing scheme based on evanescent wave interaction through locally and permanently bent single mode optical fibers is proposed. Local and permanent bends in single mode optical fibers enable significant power coupling between core and cladding modes. Order and number of excited cladding modes depend on bend features and determine the field profile at the output of the bent region. This in turn constitutes a simple mechanism to tailor the field distribution in single mode optical fibers useful for spatial light modulation. Moreover, since guided cladding modes are strongly influenced by the surrounding refractive index (SRI), the power transmitted at the output of the bent region as well as its dependence on the optical wavelength are strongly sensitive to the SRI opening new scenarios in sensing applications.
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ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2011.01.021