Highly confined plasmon modes in a finite nonplanar hybrid structure

The full vectorial numerical analysis of finite non-planar hybrid structure reveals that both highly confined bound surface plasmon modes and leaky surface plasmon modes are supported in such structure. The extremely low effective mode area associated with highly confined mode makes the waveguide a hotspot source and the tunable antenna mode which is a subdivision of leaky mode is useful for both beam steering devices and free space coupling. The dispersion propertiy, propagation length, and the confinement factor of these plasmon modes have been analyzed and presented in this study.