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.
Highlights
Focusing electromagnetic field to enhance the interaction with matter has been promoting researches and applications of nano electronics and photonics
The interaction between microwave field and matter at the nanoscale strongly drives the development of quantum information processing, sensing, and microwave photonics
It indicates that the efficient localization and detection of microwave field at the nanoscale is highly required for developing a practical quantum information device
Summary
Focusing electromagnetic field to enhance the interaction with matter has been promoting researches and applications of nano electronics and photonics. 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. Though the in-plane slotted patch antenna has been demonstrated for the enhancement of local microwave field at the deep subwavelength scale[19,28], the Johnson noise of a large metal film will decrease the spin relaxation time[29,30], which is important for quantum computing and sensing. A wireless platform can be developed for the integrated quantum information processing and quantum sensing
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