Abstract
AbstractWe propose a novel type of one‐dimensional photonic crystal composed of stack of alternating layers of dielectric and graphene sheets. Based on discontinuity in derivative of electric field component in the boundaries between graphene sheets and dielectric layers, analytical dispersion relations of this structure, for both TE and TM polarizations, is obtained. A comparison between bandgaps created in this structure and ones created in a one‐dimensional metallic photonic crystal, for normal incidence is made. It is concluded that a novel type of bandgap appears in this structure due to dissipative feature of graphene which we call it graphene absorption bandgap. Moreover, in comparison with the one‐dimensional metallic photonic crystal, the electromagnetic waves penetrate in this structure with much lower damping. Finally, since the chemical potential of graphene sheets can be modified by gate voltage, the bandgaps in the considered structure can be tuned by the gate voltage (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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