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A Graphene-Based Hybrid Plasmonic Waveguide With Ultra-Deep Subwavelength Confinement
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DOI：10.1109/JLT.2014.2350487.png)
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Abstract
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Reduction of propagation loss of terahertz graphene plasmon can be made by increasing the chemical potential of graphene layer, but at the cost of significantly increasedmodal area, which fundamentally limits the packing density on a chip. By utilizing the strong coupling between the dielectric waveguide and plasmonic modes, we propose hybrid plasmonic terahertz waveguides that not only significantly suppress the mode field confinement, but also maintain a compact modal size. A typical propagation length is 127 mu m, and optical field is confined into an ultra-small area of approximately 32.6 mu m(2) at 3 THz. This structure also exhibits ultra-low crosstalk, which shows great promise for constructing various functional devices in future terahertz integrated circuits.
Keywords:
Nanophotonics
optical waveguides
surface plasmons
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