Abstract-A Stripe Assisted Hybrid Plasmonic Waveguide for the Propagation of Terahertz Waves

Rezaei, M, ; Rasekh, P. ; Safian, R.
Mohsen Rezaei is with the  Computer Engineering Department, Isfahan University of Technology, Isfahan, Iran, 84156. (email: m.r.rezaei@ieee.org

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Using finite element method, we investigated a hybrid plasmonic terahertz waveguide with an additional stripe with a frequency of about f = 3 THz. The structure consisted of a semiconductor stripe located at the center of the gap between a five-layer graphene and a high-index dielectric ridge which were all placed on a low-index dielectric substrate. A properlysized stripe helps the power ratio inside the gap to considerably increase, and the normalized mode area to improve greatly as well. A power confinement ratio of 0.65 and a normalized mode area of 0.03 were obtained. This shows respective improvements of 30% and 72% in comparison to conventional waveguides. This structure also provides a good propagation length of about 820 μm