Ultra-subwavelength focusing and giant magnetic-field enhancement in a low-loss one-way waveguide based on remanence

The subwavelength focusing based on surface plasmon polaritons has been widely explored in tapered metallic structures. However, the efficiency of energy localization is relatively weak, largely due to high propagation loss and strong back reflection. Here, we propose a three-dimensional (3D) straig...

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Bibliographic Details
Published in:Journal of optics (2010) 2020-02, Vol.22 (2), p.25003
Main Authors: Xu, Jie, Deng, Xiaohua, Zhang, Hang, Wu, Chiaho, Wubs, Martijn, Xiao, Sanshui, Shen, Linfang
Format: Article
Language:English
Subjects:
magnetic field enhancement
one-way waveguide
remanence
subwavelength focusing
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Summary:The subwavelength focusing based on surface plasmon polaritons has been widely explored in tapered metallic structures. However, the efficiency of energy localization is relatively weak, largely due to high propagation loss and strong back reflection. Here, we propose a three-dimensional (3D) straight-tapered one-way surface magnetoplasmon (SMP) waveguide with the end surface of ∼10−4λ0 × 10−4λ0 to achieve energy focusing in the microwave regime. Due to low propagation loss of SMP, we achieve huge magnetic field enhancement in such an ultra-subwavelength area, by five orders of magnitude. Instead of using an external static magnetic field, our proposed SMP waveguide relies on remanence, which is very convenient for operating practical 3D applications. These results show promising applications in magnetic-field enhancing or quenching fluorescence, luminescence or nonlinearity of two-dimensional materials, novel scanning near-field microwave microscopy and energy storage.
ISSN:2040-8978
2040-8986
DOI:10.1088/2040-8986/ab68ef