He P H , Zhang H C, Gao X X, Niu L Y, Tang W X et al. A novel spoof surface plasmon polariton structure to reach ultra-strong field confinements.Opto-Electron Adv 2, 190001 (2019). doi: 10.29026/oea.2019.190001
Citation: He P H , Zhang H C, Gao X X, Niu L Y, Tang W X et al. A novel spoof surface plasmon polariton structure to reach ultra-strong field confinements.Opto-Electron Adv 2, 190001 (2019). doi: 10.29026/oea.2019.190001

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A novel spoof surface plasmon polariton structure to reach ultra-strong field confinements

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  • These authors contributed equally to this work

  • Corresponding author: T J Cui, E-mail: tjcui@seu.edu.cn
  • Ultrathin corrugated metallic structures have been proved to support spoof surface plasmon polariton (SPP) modes on two-dimension (2D) planar microwave circuits. However, to provide stronger field confinement, larger width of strip is required to load deeper grooves, which is cumbersome in modern large-scale integrated circuits and chips. In this work, a new spoof SPP transmission line (TL) with zigzag grooves is proposed. This new structure can achieve stronger field confinement compared to conventional one with the same strip width. In other words, the proposed spoof SPP TL behaves equivalently to a conventional one with much larger size. Dispersion analysis theoretically indicates the negative correlation between the ability of field confinement and cutoff frequencies of spoof SPP TLs. Numerical simulations indicate that the cutoff frequency of the proposed TL is lower than the conventional one and can be easily modified with the fixed size. Furthermore, two samples of the new and conventional spoof SPP TLs are fabricated for experimental demonstration. Measured S-parameters and field distributions verify the ultra-strong ability of field confinement of the proposed spoof SPP TL. Hence, this novel spoof SPP structure with ultra-strong field confinement may find wide applications in microwave and terahertz engineering.
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