Abstract

The eccentric coaxial metal waveguide is similar to concentric coaxial structure, which has been studied extensively in the plasmonics community [1,2]. Compared to the concentric structure, the eccentric structure has many benefits, including: (1) stronger subwavelength field localization around the narrowest gap, (2) improved optical coupling to the lowest order mode due to linear polarization, and (3) an increased effective index due to the gap plasmon. Yet, there have been no reports on the plasmonic aspects of this structure so far.

© 2009 IEEE