The hybrid rib-slot-rib surface plasmon waveguide where a combined rib-slot-rib structure is added on the metal substrate within a low-index gap region with asymmetric structures is proposed using finite element method. Two types of asymmetric structures are introduced and their modal properties are discussed and compared to their traditional long range surface plasmon waveguide. Our designed structures can provide enhanced confinement energy within the gap region at proper parameters. Our simulation result is a guide for turning properties of plasmonic waveguide and providing ways for improved electromagnetic energy confinement in surface plasmon waveguide.
A hybrid surface plasmon waveguide (HSPWG) with a convex rib added on the metal surface is further investigated and analyzed theoretically. The high mode confinement and long propagation distance can be realized simultaneously by optimizing the waveguide geometry. Our designed structures can provide mode area and propagation distance achieving close to λ2/512 and 2200 μm respectively, which are better than the performance of the traditional HSPWG. Our structures are excellent, promising candidates for improving plasmonic devices in the fields of ultrafast modulators and low-threshold nanolaser.
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