11 February 2017 Relative humidity sensor based on surface plasmon resonance of D-shaped fiber with polyvinyl alcohol embedding Au grating
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Abstract
This paper presents the design, fabrication, and characterization of a D-shaped fiber coated with polyvinyl alcohol (PVA) embedding an Au grating-based relative humidity (RH) sensor. The Au grating is fabricated on a D-shaped fiber to match the wave-vector and excite the surface plasmon, and the PVA is embedded in the Au grating as a sensitive cladding film. The refractive index of PVA changes with the ambient humidity. Measurements in a controlled environment show that the RH sensor can achieve a sensitivity of 5.4 nm per relative humidity unit in the RH range from 0% to 70% RH. Moreover, the surface plasmon resonance can be realized and used for RH sensing at the C band of optical fiber communication instead of the visible light band due to the metallic grating microstructure on the D-shaped fiber.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Haitao Yan, Haitao Yan, Daofu Han, Daofu Han, Ming Li, Ming Li, Bo Lin, Bo Lin, } "Relative humidity sensor based on surface plasmon resonance of D-shaped fiber with polyvinyl alcohol embedding Au grating," Journal of Nanophotonics 11(1), 016008 (11 February 2017). https://doi.org/10.1117/1.JNP.11.016008 . Submission: Received: 10 September 2016; Accepted: 24 January 2017
Received: 10 September 2016; Accepted: 24 January 2017; Published: 11 February 2017
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