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Optical Engineering

Designing and adjusting the thickness of polyvinylpyrrolidone waveguide layer on plasmonic nanofilm for humidity sensing
Author(s): Zhiqing Feng; Lan Bai; Lijiao Guo; Baosheng Cao; Jinlei Wu; Yangyang He
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Paper 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.

Paper Details

Date Published: 31 January 2017
PDF: 6 pages
Opt. Eng. 56(1) 016116 doi: 10.1117/1.OE.56.1.016116
Published in: Optical Engineering Volume 56, Issue 1
Show Author Affiliations
Zhiqing Feng, Dalian Nationalities Univ. (China)
Lan Bai, Dalian Nationalities Univ. (China)
Lijiao Guo, Dalian Nationalities Univ. (China)
Baosheng Cao, Dalian Nationalities Univ. (China)
Jinlei Wu, Dalian Nationalities Univ. (China)
Yangyang He, Dalian Nationalities Univ. (China)

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