Properties of a binary photonic crystal with an inverted symmetry and a defect layer
Physics Department, Islamic University of Gaza, Gaza, Palestine
2 Department of Applied Science & Humanities, Rajkiya Engineering College, Azamgarh, U.P., India
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Accepted: 17 November 2020
Published online: 25 November 2020
In the current work, two binary photonic crystals (BPCs) are investigated and compared. The first is composed of two layers A and B repeated 2 N times. In the first N-repetitions, they have the order AB and in the next repetitions, they have the order BA so that the BPC has an inverted symmetry with the structure (AB)N(BA)N. In the second BPC, the two repetitions have the same order AB with a defect layer C which is introduced between them so that it has a normal symmetry with a defect layer with the structure (AB)NC(AB)N. The properties of both BPCs are investigated and compared. It is found that the widths of the band gaps in the inverted symmetry BPC are larger than those of the normal symmetry BPC containing the defect mode. Both structures can have defect modes in the transmission spectra.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2020