| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Refractive index sensing of double Fano resonance excited by nano-cube array coupled with multilayer all-dielectric film |
| Xiangxian Wang(王向贤)1,†, Jian Zhang(张健)1, Jiankai Zhu(朱剑凯)1, Zao Yi(易早)2, and Jianli Yu(余建立)3 |
1 School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
2 Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China;
3 School of Electronic Engineering, Chaohu University, Chaohu 238000, China |
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Abstract We propose a hybrid structure of a nano-cube array coupled with multilayer full-dielectric thin films for refractive index sensing. In this structure, discrete states generated by two-dimensional grating and continuous states generated by a photonic crystal were coupled at a specific wavelength to form two Fano resonances. The transmission spectra and electric field distributions of the structure were obtained via the finite-difference time-domain method. We obtained the optimal structural parameters after optimizing the geometrical parameters. Under the optimal parameters, the figure of merit (FOM) values of the two Fano resonances reached 1.7×104 and 3.9×103, respectively. These results indicate that the proposed structure can achieve high FOM refractive index sensing, thus offering extensive application prospects in the biological and chemical fields.
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Received: 14 September 2021
Revised: 03 November 2021
Accepted manuscript online: 10 November 2021
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PACS:
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42.25.Bs
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(Wave propagation, transmission and absorption)
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42.25.-p
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(Wave optics)
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42.79.-e
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(Optical elements, devices, and systems)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61865008) and the Hong Liu FirstClass Disciplines Development Program of Lanzhou University of Technology. |
Corresponding Authors:
Xiangxian Wang
E-mail: wangxx869@lut.edu.cn
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Cite this article:
Xiangxian Wang(王向贤), Jian Zhang(张健), Jiankai Zhu(朱剑凯), Zao Yi(易早), and Jianli Yu(余建立) Refractive index sensing of double Fano resonance excited by nano-cube array coupled with multilayer all-dielectric film 2022 Chin. Phys. B 31 024210
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