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

Guo, Junpeng; Leong, Haisheng
December 2012
Applied Physics Letters;12/10/2012, Vol. 101 Issue 24, p241115
Academic Journal
We experimentally observed surface plasmon resonance mode splitting in a super-period metal nanohole array grating under the transverse magnetic polarization excitation. The mode splitting was observed in the zeroth order transmission and also in the first order transmission. However, the mode splitting phenomenon is more evident in the first order transmission than in the zeroth order transmission. It is explained that the mode splitting is due to the coupling between the surface plasmon resonance mode in the subwavelength period metal nanohole arrays and the resonance mode of the super-period metal grating.


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