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

Xiang-Dong Chen, En-Hui Wang, Long-Kun Shan, Ce Feng, Yu Zheng, Yang Dong, Guang-Can Guo and Fang-Wen Sun ()
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Xiang-Dong Chen: University of Science and Technology of China
En-Hui Wang: University of Science and Technology of China
Long-Kun Shan: University of Science and Technology of China
Ce Feng: University of Science and Technology of China
Yu Zheng: University of Science and Technology of China
Yang Dong: University of Science and Technology of China
Guang-Can Guo: University of Science and Technology of China
Fang-Wen Sun: University of Science and Technology of China

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-26662-5

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