Strong absorption near exceptional points in plasmonic waveguide arrays |
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| Authors: | Shaolin Ke Jianxun Liu Qingjie Liu Dong Zhao Weiwei Liu |
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| Institution: | 1.Laboratory of Optical Information Technology,Wuhan Institute of Technology,Wuhan,China;2.School of Physics,Huazhong University of Science and Technology,Wuhan,China;3.School of Electronics Information and Engineering,Hubei University of Science and Technology,Xianning,China |
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| Abstract: | We investigate the exceptional points (EPs) in plasmonic waveguide arrays, including metallic waveguide arrays (MWAs) and graphene sheet arrays (GSAs). The EPs emerge at the boundary of strong and weak coupling ranges in both systems. The cross conversion of Bloch modes and variation of geometric phase can be observed by encircling an EP in the parametric space. We also show the Bloch modes exhibit strong absorption in the vicinity of EPs in GSAs, which originates from the enhanced longitude electric field along the propagation direction. The abnormal absorption and field enhancement also arise in ultrathin MWAs and disappear when the thickness of metal film increases. Our results may find applications in optical switches and sensors at the nanoscale. |
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