Plasmonic coupler based on the nanoslit with bump |
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Authors: | Meng-Dong He Zhi-Qiang Gong Yong-Feng Luo Xiaoshuang Chen |
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Institution: | a Institute of Mathematics and Physics, Central South University of Forestry and Technology, Changsha 410004, People's Republic of Chinab National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Science, Shanghai 200083, People's Republic of Chinac College of science, Jiujiang University, Jiujiang 332005, People's Republic of China |
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Abstract: | In this paper, we propose a plasmonic coupler which is composed of a nanoslit with a bump. The slit is used to generate surface plasmon polariton (SPP), and the bump is employed as a SPP reflector. It is found that the phase difference between the SPP propagating the opposite direction to the bump and the one reflected by the bump can be periodically adjusted by the distance between the center of slit and the bump. When the constructive interference between the two SPPs occurs, the proposed structure can be regarded as a undirectional plasmonic coupler. Moreover, we also find that the propagation of the interfering SPPs is influenced by the width and length of bump. It is expected that our results may be utilized to control the electromagnetic wave in subwavelength optics. |
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Keywords: | Coupler Surface plasmon polariton Bump Current density |
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