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Focusing the electromagnetic field to 10−6λ for ultra-high enhancement of field-matter interaction

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  • Xiang-Dong Chen

    (University of Science and Technology of China
    University of Science and Technology of China)

  • En-Hui Wang

    (University of Science and Technology of China
    University of Science and Technology of China)

  • Long-Kun Shan

    (University of Science and Technology of China
    University of Science and Technology of China)

  • Ce Feng

    (University of Science and Technology of China
    University of Science and Technology of China)

  • Yu Zheng

    (University of Science and Technology of China
    University of Science and Technology of China)

  • Yang Dong

    (University of Science and Technology of China
    University of Science and Technology of China)

  • Guang-Can Guo

    (University of Science and Technology of China
    University of Science and Technology of China)

  • Fang-Wen Sun

    (University of Science and Technology of China
    University of Science and Technology of China)

Abstract

Focusing electromagnetic field to enhance the interaction with matter has been promoting researches and applications of nano electronics and photonics. Usually, the evanescent-wave coupling is adopted in various nano structures and materials to confine the electromagnetic field into a subwavelength space. Here, based on the direct coupling with confined electron oscillations in a nanowire, we demonstrate a tight localization of microwave field down to 10−6λ. A hybrid nanowire-bowtie antenna is further designed to focus the free-space microwave to this deep-subwavelength space. Detected by the nitrogen vacancy center in diamond, the field intensity and microwave-spin interaction strength are enhanced by 2.0 × 108 and 1.4 × 104 times, respectively. Such a high concentration of microwave field will further promote integrated quantum information processing, sensing and microwave photonics in a nanoscale system.

Suggested Citation

  • Xiang-Dong Chen & En-Hui Wang & Long-Kun Shan & Ce Feng & Yu Zheng & Yang Dong & Guang-Can Guo & Fang-Wen Sun, 2021. "Focusing the electromagnetic field to 10−6λ for ultra-high enhancement of field-matter interaction," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26662-5
    DOI: 10.1038/s41467-021-26662-5
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