Polarization-independent terahertz three-dimensional subwavelength confinement in coupled slot structures

摘要

We investigate subwavelength confinement of terahertz electromagnetic surface modes in a three-dimensionalregion with coupled slot structures. Two-dimensional resonance focusing on a subwavelength slot converts tothree-dimensional subwavelength confinement, due to sharp edge confinement effect on asymmetricplasmonic structure, at the center position of the slot structures which consists of two or more slots. We alsoreport on the polarization independent confinement of terahertz electromagnetic surface modes beyonddiffraction limit. The structure which consists of radially arranged subwavelength slots located at a samecenter position shows the polarization-independent terahertz three-dimensional subwavelength confinement.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.