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We experimentally observed the surface plasmon resonance mode splitting in asuper-period metal nanohole grating under the transverse magnetic polarizationexcitation. The mode splitting was observed in the zeroth order transmissionand also in the first order diffracted transmission. However, the modesplitting phenomenon is more evident in the first order transmission than inthe zeroth order transmission. It is explained that the mode splitting is dueto the coupling between the surface plasmon resonance mode in the subwavelengthperiod metal nanohole arrays and the resonance mode of the metal super-grating.

Mode splitting of surface plasmon resonances in super-period metal nanohole gratings