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

Jie Xu, Xiaohua Deng, Hang Zhang, Chiaho Wu, Martijn Wubs, Sanshui Xiao, Linfang Shen

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Abstract

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 ∼10−4 λ 0 × 10−4 λ 0 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.
Original languageEnglish
Article number025003
JournalJournal of Optics
Volume22
Issue number2
Number of pages9
ISSN1464-4258
DOIs
Publication statusPublished - 2020

Keywords

  • One-way waveguide
  • Remanence
  • Magnetic field enhancement
  • Subwavelength focusing

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