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• W3204664598 abstract "The optical properties of a graphene-based cylindrical photonic crystal are theoretically investigated based on the generalized cylindrical transfer matrix method to include the out-of-plane propagation of the cylindrical waves. It is found that Maxwell's equations have solutions for both E- and H-polarized waves only at the azimuthal mode number m=1. We study the reflectance spectrum of the structure to obtain its photonic bandgaps. We show that the reflection spectrum, in addition to the usual Bragg gaps, contains an omnidirectional bandgap at low terahertz frequencies for both E and H-polarized cylindrical waves. The robustness of this bandgap under random variations of geometrical parameters is investigated. This few-period structure is an ideal candidate for guiding waves at the low terahertz region because of its weak absorption and transmission losses. In contrast to the usual Bragg gap, the results show that in both polarizations, the width of graphene-produces bandgap reaches its maximum value when the refractive indices of the two cylindrical shells have their lowest possible values. The width of this unusual omnidirectional bandgap increases by decreasing the thicknesses of the cylindrical shells and increasing the chemical potential of the graphene monolayers." @default.
• W3204664598 created "2021-10-11" @default.
• W3204664598 creator A5078578809 @default.
• W3204664598 date "2021-09-29" @default.
• W3204664598 modified "2023-09-27" @default.
• W3204664598 title "Omnidirectional cylindrical graphene-based Bragg fiber in terahertz" @default.
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• W3204664598 doi "https://doi.org/10.1080/17455030.2021.1979690" @default.
• W3204664598 hasPublicationYear "2021" @default.
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