A Graphene-Based Hybrid Plasmonic Waveguide With Ultra-Deep Subwavelength Confinement

• DOI: 10.1109/jlt.2014.2350487
• Publication Date: 2014-08-21T14:33:25Z
• Authors: Xuetong Zhou; Tian Zhang; Lin Chen; Wei Hong; Xun Li
• Keywords: Waveguide; Crosstalk

Reduction of propagation loss terahertz graphene plasmon can be made by increasing the chemical potential layer, but at cost significantly increased modal area, which fundamentally limits packing density on a chip. By utilizing strong coupling between dielectric waveguide and plasmonic modes, we propose hybrid waveguides that not only suppress mode field confinement, also maintain compact size. A typical length is 127 μm, optical confined into an ultra-small area approximately 32.6 μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> 3 THz. This structure exhibits ultra-low crosstalk, shows great promise for constructing various functional devices in future integrated circuits.