Novel spoof surface plasmon polariton structure to reach ultra-strong field confinements with compact configuration
Surface plasmon polaritons (SPPs), which are caused by the interaction between media with positive permittivity and metal with negative permittivity at optical frequencies, are a kind of surface wave modes with strong field confinement. Although SPPs have great potential in applications, the enormous metallic loss in optical band has limited their development dramatically. To breaking the challenge of high loss of SPPs, the topic of designing special structures to achieve spoof SPPs and apply the novel modes into science and engineering area has attract lots of research interests in the decades past.
The geometric configuration of the (a) new spoof SPP TL, whose field confinement ability is controllable and stronger than that of (b) conventional spoof SPP TL
The research group of Prof. Cui in Southeast University proposes a novel ultra-thin spoof surface plasmon polariton (SPP) structures, which possess ultra-strong field confinement ability as well as compact configuration. The traditional design of spoof surface plasmon polariton structures is usually to etch the comb groove on the metal strip line. However, in order to enhance the field binding ability, a larger structure size is required, which has a great limitation on the extension of engineering application. In this paper, serrated fluted structure is designed on the metal belt line. By means of Eigen-mode analysis, full wave simulation and experimental measuring, it is shown that the structure has lower cut-off frequency and more compact field distribution than the traditional structure, which proves that the structure can realize stronger and controllable field binding ability based on smaller metal line width. On the other hand, this structure can significantly reduce the size of spoof surface plasmon polariton components under the same requirement of field confinement ability. In conclusion, this paper provides a new structure design for microwave engineering and spoof surface plasmon polariton technology, which is of great value for promoting large-scale engineering application of spoof surface plasmon polariton.
The research group of Prof. Cui in Southeast University focuses its research interests on metamaterials, computational electromagnetic, wireless power transfer, and millimeter wave technologies. The team has published over 400 peer-review journal papers in Science, PNAS, Nature Communications, Physical Review Letters, Advanced Materials, IEEE Transactions, etc. The team’s researches have been selected as one of the “Optics in 2016” by Optics and Photonics News Magazine (OSA), “10 Breakthroughs of China Optics in 2016”, “10 Breakthroughs of China Science in 2010”, “Best of 2010” in New Journal of Physics, Research Highlights in Europhysics News, Journal of Physics D: Applied Physics, Applied Physics Letters, and Nature China. Their work has been reported by Nature News, Science, MIT Technology Review, Scientific American, New Scientists, etc.
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).