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2026-04-26
Miniaturization and Transition Sharpening of Plasmonic Filters via Interdigital Capacitors
By
Progress In Electromagnetics Research C, Vol. 169, 132-137, 2026
Abstract
This paper proposes a spoof surface plasmon polariton (SSPP) based on a coplanar waveguide (CPW) with an interdigital structure, aiming to realize a plasmonic filter with both miniaturization and sharp transition characteristics. Dispersion and transition analyses demonstrate that the proposed unit exhibits flexibly controllable dispersion and transition features by tuning the geometrical parameters of the interdigital unit. Based on this, a compact filter with the proposed structure was designed, simulated, and experimentally validated. The introduction of the interdigital slot structure provides an additional degree of freedom for tuning, enabling the filter to achieve a steep transition from the passband to the stopband (with a roll-off rate of up to 181.31 dB/GHz) while maintaining a compact size. The measured results are in good agreement with the simulated ones, which verifies the effectiveness of the proposed design. In addition, the bandpass response introduced by higher-order modes offers a feasible route toward the multimode and multifunction integration of filters.
Citation
Yang-Qing Xu, Qing-Cheng Zhang, Ruijie Guo, Yuyu Fan, Yan He, and Lin Li, "Miniaturization and Transition Sharpening of Plasmonic Filters via Interdigital Capacitors," Progress In Electromagnetics Research C, Vol. 169, 132-137, 2026.
doi:10.2528/PIERC26020807
References

1. Ozbay, Ekmel, "Plasmonics: Merging photonics and electronics at nanoscale dimensions," Science, Vol. 311, No. 5758, 189-193, 2006.
doi:10.1126/science.1114849        Google Scholar

2. Zhang, D., X. Liu, Y. Sun, K. Zhang, Q. Wu, Y. Li, T. Jiang, and S. N. Burokur, "Dispersion engineering of spoof plasmonic metamaterials via interdigital capacitance structures," Optics Letters, Vol. 48, No. 6, 1383-1386, 2023.
doi:10.1364/ol.482465        Google Scholar

3. Barnes, William L., Alain Dereux, and Thomas W. Ebbesen, "Surface plasmon subwavelength optics," Nature, Vol. 424, No. 6950, 824-830, Aug. 2003.
doi:10.1038/nature01937        Google Scholar

4. Pendry, J. B., L. Martin-Moreno, and F. J. Garcia-Vidal, "Mimicking surface plasmons with structured surfaces," Science, Vol. 305, No. 5685, 847-848, 2004.
doi:10.1126/science.1098999        Google Scholar

5. Cao, Yuan, Yuming Lu, Songfeng Yin, and Xiao Hu, "A CPW-based novel SSPP reflectionless low-pass notch filter with loaded interdigitated coupling structure," IEEE Access, Vol. 12, 117863-117871, 2024.
doi:10.1109/access.2024.3446644        Google Scholar

6. Pang, Chao, Rui-Feng Cao, Lin Li, and Hai-Wen Liu, "Spoof surface plasmon polariton based on stepped grooves and its application in compact low-pass filter design," Plasmonics, Vol. 19, No. 3, 1245-1255, 2024.
doi:10.1007/s11468-023-02078-3        Google Scholar

7. Pang, Chao, Wang Xu, Lin Li, Hai-Wen Liu, Zhi Chen, and Yu-Xuan Zhang, "Hybrid spoof surface plasmon polariton based on asymmetrical coplanar waveguide," Plasmonics, Vol. 20, No. 9, 7767-7771, 2025.
doi:10.1007/s11468-025-02768-0        Google Scholar

8. Li, Jianxing, Junwei Shi, Kai-Da Xu, Ying-Jiang Guo, Anxue Zhang, and Qiang Chen, "Spoof surface plasmon polaritons developed from coplanar waveguides in microwave frequencies," IEEE Photonics Technology Letters, Vol. 32, No. 22, 1431-1434, 2020.
doi:10.1109/lpt.2020.3031065        Google Scholar

9. Cui, Yu-Xin, Jing-Yi Zhang, Lin Li, Yan-Yan Kong, and Guo-Ping Zhang, "Surface plasmon transmission line based on folded stepped grooves and spiral-shaped structures," Plasmonics, Vol. 20, 1323-1329, 2025.
doi:10.1007/s11468-024-02373-7        Google Scholar

10. Lei, Qi, Hongyu Liu, Zhi-Qiang Miao, and Guang-Hui Zheng, "Hybridization theory for plasmon resonance in metallic nanostructures," Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 481, No. 2325, 20250595, 2025.
doi:10.1098/rspa.2025.0595        Google Scholar

11. Deng, Youjun and Hongyu Liu, Spectral Theory of Localized Resonances and Applications, Springer, Singapore, 2024.
doi:10.1007/978-981-99-6244-0

12. Wang, Chuan-Min, Weiqiang Xu, Lin Li, Haiwen Liu, and Ye Kuang, "Capacitor-loaded coplanar waveguide spoof surface plasmon polariton with reduced transversal width," IEEE Photonics Technology Letters, Vol. 35, No. 10, 557-560, 2023.
doi:10.1109/lpt.2023.3263855        Google Scholar

13. Deng, Youjun, Lingzheng Kong, Hongyu Liu, and Liyan Zhu, "Elastostatics within multi-layer metamaterial structures and an algebraic framework for polariton resonances," ESAIM: Mathematical Modelling and Numerical Analysis, Vol. 58, No. 4, 1413-1440, 2024.
doi:10.1051/m2an/2024041        Google Scholar

14. Pathak, Bhushan Ballav, Rakhesh Singh Kshetrimayum, and Jiasheng Hong, "Flexible SSPP low-pass filter employing trapezium-mounted semicircular-shaped unit cell for B5G NR FR1 radio stripes network," IEEE Microwave and Wireless Technology Letters, Vol. 35, No. 10, 1478-1481, 2025.
doi:10.1109/lmwt.2025.3589106        Google Scholar

15. Moznebi, Ali-Reza and Kambiz Afrooz, "Coplanar waveguide low-pass filter based on butterfly-shaped spoof surface plasmon polaritons with compact size and constant-width transition," Wireless Personal Communications, Vol. 131, No. 4, 2463-2476, 2023.
doi:10.1007/s11277-023-10546-6        Google Scholar

16. Haghighat, Mohsen, Thomas Darcie, and Levi Smith, "Demonstration of a terahertz coplanar-strip spoof-surface-plasmon-polariton low-pass filter," Scientific Reports, Vol. 14, No. 1, 182, 2024.
doi:10.1038/s41598-023-50599-y        Google Scholar

17. Gao, Zhou-Hao, Xin-Shuo Li, Man Mao, Chen Sun, Feng-Xue Liu, Le Zhang, and Lei Zhao, "Ultra-compact low-pass spoof surface plasmon polariton filter based on interdigital structure," Micromachines, Vol. 14, No. 9, 1687, 2023.
doi:10.3390/mi14091687        Google Scholar

18. Xu, Hao, Wen-Sheng Zhao, Da-Wei Wang, and Jun Liu, "Compact folded SSPP transmission line and its applications in low-pass filters," IEEE Photonics Technology Letters, Vol. 34, No. 11, 591-594, 2022.
doi:10.1109/lpt.2022.3173657        Google Scholar

19. Kolahi, Ali and Farzin Shama, "Compact microstrip low pass filter with flat group-delay using triangle-shaped resonators," AEU --- International Journal of Electronics and Communications, Vol. 83, 433-438, 2018.
doi:10.1016/j.aeue.2017.10.022        Google Scholar

20. Ekhteraei, Milad, Mohsen Hayati, Amir Hossein Kazemi, and Sepehr Zarghami, "Design and analysis of a modified rectangular-shaped lowpass filter based on LC equivalent circuit," AEU --- International Journal of Electronics and Communications, Vol. 126, 153290, 2020.
doi:10.1016/j.aeue.2020.153290        Google Scholar

21. Azadi, Rasoul, Saeed Roshani, Arez Nosratpour, Ali Lalbakhsh, and Mohammad Hazhir Mozaffari, "Half-elliptical resonator lowpass filter with a wide stopband for low band 5G communication systems," Electronics, Vol. 10, No. 23, 2916, 2021.
doi:10.3390/electronics10232916        Google Scholar

22. Bharti, Brij Kumar and Amar Nath Yadav, "A novel miniaturized spoof surface plasmon polaritons based low pass filter with ultra-wide-stop-band," Plasmonics, Vol. 20, No. 5, 2675-2681, 2025.
doi:10.1007/s11468-024-02495-y        Google Scholar

23. Ammari, Habib, Yat Tin Chow, Hongyu Liu, and Mahesh Sunkula, "Quantum integrable systems and concentration of plasmon resonance," Journal of the European Mathematical Society, Vol. 27, No. 8, 3407-3445, 2024.
doi:10.4171/jems/1437        Google Scholar