https://doi.org/10.1140/epjd/s10053-025-01079-7
Regular Article - Photons
Modified topological photonic crystal
1 Department of Software Systems, School of Computer Science and Engineering, Vellore Institute of Technology, 632014, Vellore, Tamilnadu, India
2 Department of Communication Engineering, School of Electronics Engineering, Vellore Institute of Technology, 632014, Vellore, Tamilnadu, India
a
chittaranjan.nayak@vit.ac.in
Received:
12
June
2025
Accepted:
8
October
2025
Published online: 7 November 2025
Topological photonic crystals are innovative optical structures that leverage topological phases to achieve robust photonic bandgaps, exhibiting immunity to structural imperfections and disorder. However, a significant challenge in conventional topological photonic crystal designs has been the difficulty in precisely controlling the position of the transmission peak. To address this limitation, we present a modified topological photonic crystal composed of alternating 
and 
layers. This design incorporates a synergistic approach that integrates the transfer matrix method, quarter-wavelength thickness design principles, and iterative optimization of layer parameters to ensure precise wavelength alignment and enhanced spectral control. The proposed modified topological photonic crystal demonstrates superior performance, including wider photonic bandgaps, moderate transmission efficiency, and improved resistance to structural defects.
Graphical Abstract: Top panel: Schematic diagrams of the proposed structure without modification (top) and with modification (bottom), together with the transmission spectra for the symmetric (red) and topological (blue) structures. Bottom panel: Transmission spectra (blue line), average transmission over perturbation (red line), and mean square error (gray shaded region) for the symmetric structure (left), topological structure (middle), and modified topological structure (right).
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
