Abstract
Excitation of plasmonic modes is investigated on a grating having a double-step rectangle profile. A single-step grating excites one side of a plasmonic mode, whereas the double-step profile can induce odd and even plasmonic modes simultaneously. The mode wavelength of the double-step grating can be individually controlled by selecting the rule density and the depths of the steps. In addition, the field intensity on the double-step grating has wider and stronger distributions than that appearing on the single-step grating.
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