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Published on: November 30, 2012
Investigation of the wave behaviors inside a step-modulated subwavelength metal slit
Chao Li1, Yun-Song Zhou, Huai-Yu Wang
1School of Mathematical Sciences, Capital Normal University, Beijing 100048, China. lichao19840621@163.com
Abstract:
In this paper, we applied the modal expansion method (MEM) to investigate the wave behaviors inside a step-modulated subwavelength metal slit. The physical mechanism of the surface plasmon polariton (SPP) transmission is investigated in detail for slit structures with either dielectric or geometric modulation. The applicability of the effective index method is discussed. Moreover, as a special case of the geometric modulation, the evanescent-wave assisted transmission is demonstrated in a thin-modulated slit. We emphasize that a complete set is necessary in order to expand the wave functions in these kinds of structures. All the calculated results by the MEM are well retrieved by the finite-difference time-domain calculation.
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