We investigate the surface plasmon resonance in super-period nanohole arrays and demonstrate a surface plasmon resonance spectrometer using a super-period metal nanohole array device. Super-period nanohole arrays are patterned metal nanohole array gratings. In a super-period nanohole array, there is a small subwavelength nanohole period that supports local surface plasmon resonance, and also a large grating period that diffracts surface plasmon radiations to non-zeroth order diffractions. With the super-period metal nanohole array, surface plasmon resonance can be measured in the first order diffraction in addition to be traditionally measured in the zeroth order transmission. The resonance peak wavelength measured in the first order diffraction is slightly blue-shifted from the resonance wavelength measured in the zeroth order transmission.
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