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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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Original Article Open Access
A novel spoof surface plasmon polariton structure to reach ultra-strong field confinements
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Abstract
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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References
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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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- Figure 1. The detailed geometric configuration of the new spoof SPP TL and conventional spoof SPP TL.
- Figure 2. The simulated dispersion curves for the two kinds of spoof SPP TLs with different geometric parameters and the plot of the relationship between depth of grooves and cutoff frequency.
- Figure 3. Schematic diagram of the conversion structures between CPW and the new spoof SPP TLs, which is composed of tapered strip, gradient zigzag corrugations and flaring ground.
- Figure 4. Simulated S-parameters of the whole structures with different X and Y.
- Figure 5. The simulated transmission coefficients of the two samples with different lengths of spoof SPP TL.
- Figure 6. The simulated amplitude distributions of electric field on the cross sections of the typical spoof SPP TL with straight grooves and the new spoof SPP TL with undulant grooves at 6 GHz.
- Figure 7. Two samples of the typical spoof SPP TL with straight grooves and the new spoof SPP TL with undulant grooves.
- Figure 8. The measured S-parameters of the two samples with straight grooves (X=0 mm) and zigzag grooves (X=1.5 mm).
- Figure 9. The photograph of the electromagnetic measurement system which is composed of a electromagnetic shielding chamber, a VNA and a monopole antenna (as a probe) installed in a mechanical platform which can scan the plane or space under the control of stepper motor.
- Figure 10. Simulated (a, b, c, d) and measured (e, f, g, h) near-field distributions of z-component of electric fields of the conventional (a, b, e, f) and proposed (c, d, g, h) spoof SPP structures at 6 GHz and 8 GHz.
