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A high-performance multi-wavelength optical switch based on multiple Fano resonances in an all-dielectric metastructure

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Abstract

The multi-wavelength optical switch based on an all-dielectric metastructure consisting of four asymmetric semi-circular rings was designed and analyzed in this paper. Four Fano resonance modes, which can be explained by bound states in the continuum (BIC) theory, are excited in our structure with a maximum Q-factor of about 2 450 and a modulation depth close to 100%. By changing the polarization direction of the incident light, the transmission amplitude of Fano resonances can get effectively modulated. Based on this tuning property, the metastructure can achieve a multi-wavelength optical switch in the near-infrared region (900–980 nm) and the maximum extinction ratio can reach 38.3 dB. In addition, the results indicate that the Fano resonances are sensitive to the changes in the refractive index. The sensitivity (S) and the figure of merit (FOM) are 197 nm/RIU and 492 RIU−1. The proposed metastructure has promising potential in applications such as optical switches, sensors, modulators and lasers.

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Authors and Affiliations

  1. School of Physics Science and Information Engineering, Liaocheng University, Liaocheng, 252000, China

    Shuangshuang Cao, Xinye Fan, Wenjing Fang, Huawei Chen & Chenglin Bai

  2. Shandong Provincial Key Laboratory of Optical Communication Science and Technology, Liaocheng, 252000, China

    Xinye Fan, Wenjing Fang & Chenglin Bai

  3. Liaocheng Key Laboratory of Industrial-Internet Research and Application, Liaocheng, 252000, China

    Xinye Fan, Wenjing Fang & Chenglin Bai

  4. Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China

    Xinye Fan

  5. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China

    Cunzhu Tong

Authors
  1. Shuangshuang Cao
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  2. Xinye Fan
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  3. Wenjing Fang
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  4. Huawei Chen
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  5. Chenglin Bai
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  6. Cunzhu Tong
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Corresponding authors

Correspondence to Xinye Fan or Cunzhu Tong.

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The authors declare no conflict of interest.

Additional information

This work has been supported by the Cultivation Plan for Young Scholars in Universities of Shandong Province (No.2021RC085), the Natural Foundation of Shandong Province (Nos.ZR2021MF053, ZR2022MF253, ZR2021MF070 and ZR2022MF305), and the Open Fund of the Key State Laboratory (BUPT, IPOC) (No.IPOC2021B07).

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Cao, S., Fan, X., Fang, W. et al. A high-performance multi-wavelength optical switch based on multiple Fano resonances in an all-dielectric metastructure. Optoelectron. Lett. 20, 193–199 (2024). https://doi.org/10.1007/s11801-024-3147-9

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  • DOI: https://doi.org/10.1007/s11801-024-3147-9

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