中国物理B ›› 2014, Vol. 23 ›› Issue (3): 34202-034202.doi: 10.1088/1674-1056/23/3/034202
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
王瑛琪a b, 王艳花c, 郑显华b, 叶佳声b, 张岩a b, 刘树田a
Wang Ying-Qi (王瑛琪)a b, Wang Yan-Hua (王艳花)c, Zheng Xian-Hua (郑显华)b, Ye Jia-Sheng (叶佳声)b, Zhang Yan (张岩)a b, Liu Shu-Tian (刘树田)a
摘要: The transmission of normally incident plane wave through an array of subwavelength metallic slits curved with a single step or mutli-step has been explored theoretically. The transmission spectrum is simulated by using the finite-difference time-domain method. The influences of surface plasmon polaritons make the end of finite long sub-wavelength metallic slit behaves as magnetic-reflecting barrier. The electromagnetic fields in the subwavelength metallic slits are the superposition of standing wave and traveling wave. The standing electromagnetic oscillation behaves like LC oscillating circuit to decide the resonance wavelength. Therefore, the parameters of adding step may change the LC circuit and influence the transmission wavelength. A new explanation model is proposed in which the resonant wavelength is decided by four factors: the changed length for electric field, the changed length for magnetic field, the effective coefficient of capacitance, and the effective coefficient of inductance. The effect of adding step is presented to analyze the interaction of two steps in slit with mutli-step. This explanation model has been proved by the transmission through arrayed subwavelength metallic slits curved with two steps and fractal steps. All calculated results are well explained by our proposed model.
中图分类号: (Wave propagation, transmission and absorption)