• Chinese Optics Letters
  • Vol. 19, Issue 10, 102202 (2021)
Chao Liu1、*, Jingwei Lü1, Wei Liu1, Famei Wang1, and Paul K. Chu2
Author Affiliations
  • 1School of Physics and Electronic Engineering, Northeast Petroleum University, Daqing 163318, China
  • 2Department of Physics, Department of Materials Science & Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Hong Kong, China
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    Abstract

    Optical fibers have been widely applied to telecommunication, imaging, lasers, and sensing. Among the different types of fibers, photonic crystal fibers (PCFs), also called microstructured optical fibers, characterized by air holes arranged along the length of fibers have experienced tremendous advance due to their unique advantages. They are regarded as a desirable platform to excite surface plasmon resonance (SPR) because of easy realization of phase matching conditions between the fundamental core mode and the plasmonic mode, which plays a critical role in miniaturization and integration of SPR sensors. In this mini-review, the current status of PCF sensors based on SPR is summarized. The theory of SPR is discussed, and simulation methods for PCF-SPR sensors are described. The important parameters including the refractive index detection range, resonance wavelength, and spectral sensitivity responsible for the sensing properties of PCF-SPR sensors are reviewed. The fabrication and the comparison of performances are also illustrated, and, finally, the challenges and future perspectives are outlined.
    ksp=ωcεmεsεm+εs=ωcεmns2εm+ns2,

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    E=E0expj(ωtk·r)=E0expj(ωtkxxkyykzz),

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    k=kx2+ky2+kz2=n2πλ=nωc,

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    Eev=E0eκy2yexpj(ωtkxx).

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    kev=kx=ωcε0sinθ,

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    R=|r012p|2=|ErpEip|2=|r01p+r12pexp(2ikz1d)1+r01pr12pexp(2ikz1d)|2,

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    rikp=(kziεikzkεk)/(kziεi+kzkεk),

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    kz1=k02εkkx2,

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    kev=ωcε0sinα=ksp=Re(ωcεmεsεm+εs).

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    αloss=8.686×2πλIm(neff)×107(dB/cm),

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    εAg(ω)=ε+σ/ε0iω+p=14Cpω2+APiω+Bp.

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    S(λ)=ΔλΔnana(nm/RIU),

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    R=ΔnanaΔλmin/Δλ=Δλmin/S(λ),

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    SA(λ)=1α(λ,nana)α(λ,nana)nana(RIU1),

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    FOM=η(eV·RIU1)FWHM(eV),

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    Copy Citation Text
    Chao Liu, Jingwei Lü, Wei Liu, Famei Wang, Paul K. Chu. Overview of refractive index sensors comprising photonic crystal fibers based on the surface plasmon resonance effect [Invited][J]. Chinese Optics Letters, 2021, 19(10): 102202
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    Category: Optical Design and Fabrication
    Received: Jan. 21, 2021
    Accepted: Mar. 17, 2021
    Published Online: Sep. 2, 2021
    The Author Email: Chao Liu (msm-liu@126.com)