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Subwavelength diffraction in a limited number of metal waveguide arrays |
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| Authors: | Xiaoyan Shi Xiaoshuang Chen |
| Affiliation: | 1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Department of Applied Physics, Donghua University, Shanghai, China;2. College of Science, Information Engineering University of PLA, Zhengzhou, China;3. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, China |
| Abstract: | Subwavelength diffraction in a limited number of nanostructured metal waveguide arrays has been investigated. We use a new method to derive the coupling constant. Perturbation approach and supermode theory are employed to obtain the solution for propagation constants and wave functions. The distributions of the field intensity with propagation distance are obtained accurately. Our theories are verified by the finite-difference time-domain method. Numerical simulation results show a good agreement with the theoretical predictions. |
| Keywords: | metal waveguide arrays subwavelength diffraction surface plasmon propagations supermode theory |