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Suppressing material loss in the visible and near-infrared range for functional nanophotonics using bandgap engineering

Author

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  • Mingsong Wang

    (The University of Texas at Austin
    Photonics Initiative, Advanced Science Research Center, City University of New York)

  • Alex Krasnok

    (Photonics Initiative, Advanced Science Research Center, City University of New York)

  • Sergey Lepeshov

    (Department of Physics and Engineering, ITMO University)

  • Guangwei Hu

    (Photonics Initiative, Advanced Science Research Center, City University of New York
    National University of Singapore)

  • Taizhi Jiang

    (The University of Texas at Austin)

  • Jie Fang

    (The University of Texas at Austin)

  • Brian A. Korgel

    (The University of Texas at Austin)

  • Andrea Alù

    (Photonics Initiative, Advanced Science Research Center, City University of New York
    City University of New York)

  • Yuebing Zheng

    (The University of Texas at Austin)

Abstract

All-dielectric nanostructures have recently opened exciting opportunities for functional nanophotonics, owing to their strong optical resonances along with low material loss in the near-infrared range. Pushing these concepts to the visible range is hindered by their larger absorption coefficient, thus encouraging the search for alternative dielectrics for nanophotonics. Here, we employ bandgap engineering to synthesize hydrogenated amorphous Si nanoparticles (a-Si:H NPs) offering ideal features for functional nanophotonics. We observe significant material loss suppression in a-Si:H NPs in the visible range caused by hydrogenation-induced bandgap renormalization, producing strong higher-order resonant modes in single NPs with Q factors up to ~100 in the visible and near-IR range. We also realize highly tunable all-dielectric meta-atoms by coupling a-Si:H NPs to photochromic spiropyran molecules. ~70% reversible all-optical tuning of light scattering at the higher-order resonant mode under a low incident light intensity is demonstrated. Our results promote the development of high-efficiency visible nanophotonic devices.

Suggested Citation

  • Mingsong Wang & Alex Krasnok & Sergey Lepeshov & Guangwei Hu & Taizhi Jiang & Jie Fang & Brian A. Korgel & Andrea Alù & Yuebing Zheng, 2020. "Suppressing material loss in the visible and near-infrared range for functional nanophotonics using bandgap engineering," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-18793-y
    DOI: 10.1038/s41467-020-18793-y
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    Cited by:

    1. Mingcheng Panmai & Jin Xiang & Shulei Li & Xiaobing He & Yuhao Ren & Miaoxuan Zeng & Juncong She & Juntao Li & Sheng Lan, 2022. "Highly efficient nonlinear optical emission from a subwavelength crystalline silicon cuboid mediated by supercavity mode," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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