Relative humidity sensor based on surface plasmon resonance of D-shaped fiber with polyvinyl alcohol embedding Au grating

Haitao Yan; Daofu Han; Ming Li; Bo Lin

doi:10.1117/1.JNP.11.016008

11 February 2017 Relative humidity sensor based on surface plasmon resonance of D-shaped fiber with polyvinyl alcohol embedding Au grating

Haitao Yan, Daofu Han, Ming Li, Bo Lin

Author Affiliations +

Journal of Nanophotonics, Vol. 11, Issue 1, 016008 (February 2017). https://doi.org/10.1117/1.JNP.11.016008

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.

Citation Download Citation

Haitao Yan, Daofu Han, Ming Li, and 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

Received: 10 September 2016; Accepted: 24 January 2017; Published: 11 February 2017

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