• Chinese Optics Letters
  • Vol. 20, Issue 5, 053601 (2022)
Shunshuo Cai1, Wanhan Hu1, Yiman Liu1, Juan Ning2, Sixuan Feng2, Chao Jin2, Lingling Huang1, and Xin Li1、*
Author Affiliations
  • 1Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
  • 2School of Computer Science and Technology, Beijing Institute of Technology, Beijing 100081, China
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    DOI: 10.3788/COL202220.053601 Cite this Article Set citation alerts
    Shunshuo Cai, Wanhan Hu, Yiman Liu, Juan Ning, Sixuan Feng, Chao Jin, Lingling Huang, Xin Li. Optical fiber hydrogen sensor using metasurfaces composed of palladium[J]. Chinese Optics Letters, 2022, 20(5): 053601 Copy Citation Text show less
    (a) Schematic of the Pd-based metasurface considered in this study. Pd nanodisks are separated from an Au mirror by a dielectric spacer layer (magnesium fluoride, MgF2). Upon H2 absorption, the dielectric function and the size of the Pd nanodisks change, leading to a change in the reflectance spectrum of the structure. (b) The H2 sensor is composed by a metasurface and a fiber flange plate that serves as a connector to the optical fiber. Inset: cross section of the fiber flange plate and the detail of the metasurface next to the fiber tip.
    Fig. 1. (a) Schematic of the Pd-based metasurface considered in this study. Pd nanodisks are separated from an Au mirror by a dielectric spacer layer (magnesium fluoride, MgF2). Upon H2 absorption, the dielectric function and the size of the Pd nanodisks change, leading to a change in the reflectance spectrum of the structure. (b) The H2 sensor is composed by a metasurface and a fiber flange plate that serves as a connector to the optical fiber. Inset: cross section of the fiber flange plate and the detail of the metasurface next to the fiber tip.
    Calculated reflectance difference spectra for varying Pd disk diameters and spacer thicknesses, for a disk thickness of 20 nm and period of 360 nm.
    Fig. 2. Calculated reflectance difference spectra for varying Pd disk diameters and spacer thicknesses, for a disk thickness of 20 nm and period of 360 nm.
    Calculation of the reflectance of the Pd (red dot line) and Pd hydride (black double-dot dash line) as a function of incident wavelength.
    Fig. 3. Calculation of the reflectance of the Pd (red dot line) and Pd hydride (black double-dot dash line) as a function of incident wavelength.
    Calculation of the reflectance with the varying thicknesses of the spacer layer and incident wavelength for (a) Pd disk and (b) Pd hydride disk. (c) Calculation of the reflectance difference with the varying thicknesses of the spacer layer and incident wavelength when the phase transition has happened.
    Fig. 4. Calculation of the reflectance with the varying thicknesses of the spacer layer and incident wavelength for (a) Pd disk and (b) Pd hydride disk. (c) Calculation of the reflectance difference with the varying thicknesses of the spacer layer and incident wavelength when the phase transition has happened.
    Shunshuo Cai, Wanhan Hu, Yiman Liu, Juan Ning, Sixuan Feng, Chao Jin, Lingling Huang, Xin Li. Optical fiber hydrogen sensor using metasurfaces composed of palladium[J]. Chinese Optics Letters, 2022, 20(5): 053601
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