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

We investigate subwavelength confinement of terahertz electromagnetic surface modes in a three-dimensional region with coupled slot structures. Two-dimensional resonance focusing on a subwavelength slot converts to three-dimensional subwavelength confinement, due to sharp edge confinement effect on asymmetric plasmonic structure, at the center position of the slot structures which consists of two or more slots. We also report on the polarization independent confinement of terahertz electromagnetic surface modes beyond diffraction limit. The structure which consists of radially arranged subwavelength slots located at a same center position shows the polarization-independent terahertz three-dimensional subwavelength confinement.