Related papers: Focus the electromagnetic field to $10^{-6} \lambda$ for ultra-high enhancement of field-matter interaction

Focus the electromagnetic field to $10^{-6} \lambda$ for ultra-high enhancement of field-matter interaction

URL: http://arxiv.org/abs/2105.06032v1
Date: Thu, 13 May 2021 01:41:29 GMT
Title: Focus the electromagnetic field to $10^{-6} \lambda$ for ultra-high enhancement of field-matter interaction
Authors: Xiang-Dong Chen, En-Hui Wang, Long-Kun Shan, Ce Feng, Yu Zheng, Yang Dong, Guang-Can Guo, Fang-Wen Sun
Abstract summary: A hybrid nanowire-bowtie antenna is designed to focus the free-space microwave to this deep-subwavelength space. Such an extreme concentration of microwave field will further promote integrated quantum information processing, sensing and microwave photonics in a nanoscale system.
Score: 10.43203496161031
License: http://creativecommons.org/licenses/by/4.0/
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 an extreme localization of microwave field down to 10$^{-6}\lambda$. 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$\times$10$^{8}$ and 1.4$\times$10$^{4}$ times, respectively. Such an extreme concentration of microwave field will further promote integrated quantum information processing, sensing and microwave photonics in a nanoscale system.

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