Plasmonic critical angle in optical transmission through subwavelength metallic gratings |
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Authors: | Wang Zhonghua Li Guangyuan Xiao Feng Lu Fan Li Kun Xu Anshi |
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Affiliation: | State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronic Engineering and Computer Science, Peking University, Beijing, 100871, China. |
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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. |
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