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Ultra-broadband reflectors covering the entire visible regime based on cascaded high-index-contrast gratings

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Abstract

We report the design of ultra-broadband, highly reflective all-dielectric reflectors covering the entire visible regime based on two cascaded subwavelength high-index-contrast gratings (HCGs). We find that the spectral distance between the two gratings’ reflective bandwidths, which should be appropriately designed in order to extend the overall bandwidth for high reflectivity, is analogous to the well-known Rayleigh, Abbe and Sparrow criteria for resolution limits. Results illustrated with TM-polarized normal incidence show that high reflectivity above 98.5% covering 400–800 nm can be achieved for two cascaded HCGs with an appropriate spectral distance. The effects of key structural parameters on the bandwidth extension are discussed with physical insights. We expect this work will advance the engineering and applications of HCGs as ultra-thin, ultra-broadband and all-dielectric reflectors.

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Acknowledgements

The work was supported by the Shenzhen Research Foundation (JCYJ20170413152328742, JCYJ20180507182444250).

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Authors and Affiliations

  1. Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information Optoelectronic Science and Engineering, South China Normal University, Guangzhou, 510006, China

    Xingzhe Shi, Changshui Chen & Songhao Liu

  2. CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China

    Xingzhe Shi, Yuanfu Lu & Guangyuan Li

Authors
  1. Xingzhe Shi
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  2. Yuanfu Lu
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  3. Changshui Chen
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  4. Songhao Liu
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  5. Guangyuan Li
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Correspondence to Guangyuan Li.

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Shi, X., Lu, Y., Chen, C. et al. Ultra-broadband reflectors covering the entire visible regime based on cascaded high-index-contrast gratings. Appl. Phys. B 126, 188 (2020). https://doi.org/10.1007/s00340-020-07542-0

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