Lasers, Fiber Optics, and Communications

Designing and adjusting the thickness of polyvinylpyrrolidone waveguide layer on plasmonic nanofilm for humidity sensing

[+] Author Affiliations
Zhiqing Feng, Lijiao Guo, Baosheng Cao, Jinlei Wu, Yangyang He

Dalian Nationalities University, Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Dalian, China

Lan Bai

Dalian Nationalities University, College of Mechanical and Electronic Engineering, Dalian, China

Opt. Eng. 56(1), 016116 (Jan 31, 2017). doi:10.1117/1.OE.56.1.016116
History: Received November 4, 2016; Accepted January 5, 2017
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Abstract.  We developed a fast response and high-resolution plasmonic waveguide sensor for sensing environmental humidity by converting the optical signal in the visible light region. The sensor was designed as a layer-on-layer film structure in which the hydrophilic polymer of polyvinylpyrrolidone (PVP) film served as the waveguide layer and was dip-coated onto the plasmonic gold (Au) nanofilm for sensing the environmental humidity. The amount of the absorbed water molecules on the PVP layer could affect the refractive index and thickness of the PVP, leading to a shift of the surface plasmon resonance peak position of Au nanofilm at the different order modes of the waveguide. The theoretic calculations indicated that the optimal thickness of the waveguide layer on the Au nanofilm ranged from 550 to 650 nm. By adjusting the thickness of the PVP layer to 560 nm, the high-resolution optical signals were observed in the visible light region with the humidity shifts ranging from 11% to 85% relative humidity (RH). Our work details a successful attempt to design and prepare the plasmonic waveguide sensor with the lost-cost polymer as the sensing layer for real-time detection of environmental humidity.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Zhiqing Feng ; Lan Bai ; Lijiao Guo ; Baosheng Cao ; Jinlei Wu, et al.
"Designing and adjusting the thickness of polyvinylpyrrolidone waveguide layer on plasmonic nanofilm for humidity sensing", Opt. Eng. 56(1), 016116 (Jan 31, 2017). ; http://dx.doi.org/10.1117/1.OE.56.1.016116


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