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Hai-Xu Cui, Xue-Wei Cao, Ming Kang, Teng-Fei Li, Mu Yang, Tian-Jing Guo, Qing-Hua Guo, and Jing Chen, "Exceptional points in extraordinary optical transmission through dual subwavelength metallic gratings," Opt. Express 21, 13368-13379 (2013)