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(a) Effective mode index of fundamental and second order modes in a single graphene coated nanowire as a function of wire radius. (b) Dependence of the wavenumber of the GNW pair modes on the spacing between the wires. Inset shows the mode profile (z-component of electric field) of odd and even modes in GNW pair with R = 50 nm and d = 150 nm. Dashed line shows the wavenumber of fundamental mode of single GNW. Frequency is 30 THz.
