Abstract
The existence of broadband slow-waves through slab waveguide comprised of sub-wavelength-sized bulk gold and bounded with graphene and silica layers was investigated. A monolayer of graphene medium was taken to be interposed between the gold core and the silica cladding (of the guide). The dispersion behavior exhibits that the guide supports only the fundamental transverse magnetic (TM0) mode, whereas the transverse electric (TE) and the higher order TM modes are blocked. Furthermore, slow-waves can sustain in the guide in the entire visible region of the electromagnetic spectrum.
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