Zhou, Fengyu, Fang Liu, Long Xiao, Kaiyu Cui, Xue Feng, Wei Zhang, and Yidong Huang. “Extending the Frequency Range of Surface Plasmon Polariton Mode With Meta-Material”. Nano-Micro Letters 9, no. 1 (September 27, 2016): 9. Accessed February 2, 2026. https://www.nmlett.org/index.php/nml/article/view/363.