title: Plasmonic critical angle in optical transmission through subwavelength metallic gratings.
abstract: We observe and theoretically analyze the plasmonic analog of the critical angle phenomenon in optical transmission through subwavelength gratings milled in an optically thick metal film. The total transmission from a denser medium to a less dense one vanishes while the total reflection holds very strong, providing the incidence angle increases past the plasmonic critical angle (PCA). The conditions and physical origins of the total internal reflection above the PCA are clarified.
authors.affiliation: State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronic Engineering and Computer Science, Peking University, Beijing, 100871, China.
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Wang
authors.forename: Guangyuan
authors.initials: G
authors.lastname: Li
authors.forename: Feng
authors.initials: F
authors.lastname: Xiao
authors.forename: Fan
authors.initials: F
authors.lastname: Lu
authors.forename: Kun
authors.initials: K
authors.lastname: Li
authors.forename: Anshi
authors.initials: A
authors.lastname: Xu