We fabricate samples of aluminum ultrathin films withudhexagonal nanohole arrays and characterize the transmission performance. High optical transmittance larger than 60% over a broad wavelength range from 430 nm to 750 nm is attained experimentally. The Fano-type resonance of the excited surface plasmon plaritons and the directlyudtransmitted light attribute to both of the broadband transmission enhancement and the transmission suppression dips.
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