Optical Transmission in Arrayed Asymmetric Multilayered Ultra-Thin Metal Stripes

An arrayed structure of asymmetric multilayered ultra-thin metal stripes is proposed to achieve a narrow transmission peak in an ultra-broad transmission valley, which is formed due to the destructive multiple-interference tunneling existed in an ultra-thin metal and dielectric multilayers. The transmission peak is influenced by two resonant modes. One is the coupled gap surface plasmon (cg-SP) resonance mode confined in entire multilayered ridges, the other is the modified gap surface plasmon (g-SP) mode within metal-dielectric layers. Furthermore, the transmission mode and the stopband are tunable in a wide range through designing the dimension parameters. The proposed plasmonic structure is promising for wideband filters.