Slow electromagnetic wave guided in subwavelength region along one-dimensional periodically structured metal surface

Abstract

A perfect electric conductor surface with one-dimensional periodic rectangle holes is proposed as a surface-plasmon-like waveguide, where designed surface plasmon modes with very low group velocity are confined in a subwavelength region. It is shown that the half maximum of electric field intensity of the mode can be confined in a $0.20\lambda \times 0.10\lambda$ subwavelength region on the transversal plane and the group velocity approaches to zeros, where $\lambda$ is the wavelength in vacuum.