Tapered Plasmonic Waveguide for Terahertz Interconnects: an FDTD Method

An ultra-compact interconnect is demonstrated using tapered dielectric-loaded graphene plasmonic structure. The proposed interconnect can squeeze Terahertz (THz) wave to sub-wavelength which is promising for ultra-compact THz integrated circuits. Calculations are performed using the finite-difference time-domain method. The power density and power transmittance are calculated for two structures, a tapered interconnect and an ordinary uniform interconnect. The results show that the tapered structure can eliminate the effect of propagation losses by increasing the power density at the end of the tapered section. Moreover, the proposed structure can couple THz wave to a device with a sub-wavelength dimension of about λ
air
/20.