Narrow-band optical transmission of metallic nanoslit arrays

NSFC [61275063]; National Key Scientific Program [2012CB933503]; Natural Science Foundation of Fujian Province of China [2011J06002]; Fundamental Research Funds for the Central Universities [2012121009]Metallic nanoslit arrays usually demonstrate wide transmission bands for transverse-magnetic-polarized incidence light. Here, we show that by introducing multi-dielectric layers underneath the metallic structure layer on the substrate, a narrow peak is formed, whose bandwidth can be down to a few nanometers. Three types of resonance modes in the region under the metal layer are identified responsible for the formation of the peak, i.e., a two-dimensional cavity resonance mode, which supports optical transmission, and two in-plane hybrid surface plasmon resonance modes locating on both sides of the peak that suppresses the transmission. Such structures can be applied in advanced photonic devices. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4764113