Polarization-Tunable Plasmon-Enhanced Extraordinary Transmission Through Metallic Films Using Asymmetric Cruciform Apertures

Plasmon-enhanced transmission of light incident on a periodic array of nanoscale, asymmetric cruciform patterns is demonstrated. The corresponding transmission spectra are shown to be polarization dependent and possess unique properties, such as the existence of isosbestic points for which the transmission is polarization insensitive. Transmission peaks corresponding to localized surface plasmon resonances and extended surface plasmons are also identified. (C) 2007 Optical Society of America.