Extraordinary transmission in a complementary metallic disk and hole array for Terahertz waves

An extraordinary transmission effect for terahertz (THz) waves in a complementary metallic disk and hole array was experimentally and numerically demonstrated. Moreover, this result was also theoretically confirmed that the enhanced transmission peak in this structure was contributed both by the SPPs excited on the metallic structures and also the resonance in the dielectric rod between the metallic disk and hole. This novel plasmonic structure shows great promising applications in THz sensing and filtering.