Tunable Photonic Crystals Containing Graphene and PEDOT:PSS Polymer in THz |
| A. Gharaati, M. Ranjbar
Department of Physics, Payame Noor University, Tehran 19395-4697, Iran |
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| In this work, the optical properties of one-dimensional photonic crystal structures which contain two dielectrics combined with graphene layers, and Poly (3,4-ethylenedioxythiophene):poly (4-styrenesulfonate) (PEDOT:PSS), are reported by using the transfer matrix method. For this purpose, an ideal crystal composed of an alternating layer of SiO2 and Si is considered. The permittivity of the conductive polymer PEDOT:PSS is calculated as a function of the frequency from the Drude-Smith model. When PEDOT:PSS inserts as a defect layer in the two proposed structures with and without graphene layers, the resonant defect mode appears in prohibited region. Results show that the arrangement of graphene layers in the structures tunes the position and height of the resonance mode. The graphene chemical potential and the incident angle of the transverse electric wave also affects the tuning of the PBGs and resonant modes. Therefore, the proposed structures can be beneficial in the fabrication of the tunable low terahertz filters. |
DOI:10.12693/APhysPolA.140.433 topics: photonic crystal, graphene, polymer PEDOT:PSS, terahertz frequency range |