Abstract
We show that the slit-to-groove distance for a maximal transmission through the nano-slit surrounded with periodic grooves cannot be predicted by the theory of constructive interference between the groove-generated surface plasmon wave (SPW) and the incident wave. A clear physical explanation is given for the dependence of the transmission on the slit-to-groove distance. It is shown that the influence to the transmission comes from three parts: the groove-generated SPW, the incident wave and the nano-slit-generated SPW. The groove-generated SPW is the main factor determining the local field distribution around the nano-slit opening. The influence of the incident wave is very weak when strong SPW is generated on the input surface by many periods of deep grooves. The nano-slit-generated SPW can also be considered as a disturbance to the light distribution on the input surface.
Highlights
(ε m + ε d )), where εm and εd are the relative permittivities of the metal and the dielectric in immediate contact with the metal surface, respectively
One sees that the dashed curve oscillates with the same features as the thin solid curve, and has similar features but with some mismatches compared with the thick solid curve
The authors of Ref. [9] proposed a magnetic field phase theory and argued that the maximal transmission through the nano-slit corresponds to constructive interference between the groove-generated surface plasmon wave (SPW) and the incident plane wave at the nano-slit center, which was realized by adjusting the slit-to-groove distance to L ≈ 0.5λsp
Summary
(ε m + ε d )), where εm and εd are the relative permittivities of the metal and the dielectric in immediate contact with the metal surface, respectively.
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