Cladding mode characteristics simulation of an excessively tilted fiber grating coated with gold nanoshells

The cladding mode characteristics simulation of an excessively tilted fiber grating (ExTFG) coated with gold nanoshells was conducted in this study. First, the effective refractive indices of the core and cladding mode before coating were obtained by solving the eigenvalue equation of the three-laye...

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Bibliographic Details
Published in:Applied optics (2004) 2022-07, Vol.61 (19), p.5552
Main Authors: Liu, Kaijun, Luo, Binbin, Wu, Decao, Gu, Hong, Yang, Xiangwen
Format: Article
Language:English
Subjects:
Cladding
Eigenvalues
Finite element method
Gold
Gratings (spectra)
Refractivity
Sensitivity
Simulation
Waveguides
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Summary:The cladding mode characteristics simulation of an excessively tilted fiber grating (ExTFG) coated with gold nanoshells was conducted in this study. First, the effective refractive indices of the core and cladding mode before coating were obtained by solving the eigenvalue equation of the three-layer waveguide structure, and the coupling characteristics were briefly analyzed. Then H E 1 , m and E H 1 , m modes were selected as the research objects, and the spectral characteristics of ExTFG coated with gold nanoshells were simulated by the finite element method. The simulated refractive index sensitivity of H E 1 , 29 and E H 1 , 29 modes is 160.16 and 185.03 nm/RIU, respectively. Compared with the non-localized surface plasmon resonance (LSPR) effect, it increased by 10.76 nm/RIU (7.2%) and 19.53 nm/RIU (11.8%), respectively. Thus, the LSPR effect was verified to be beneficial to improve the refractive index sensitivity of ExTFG.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.459864