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Inverse Design of Photonic Topological Insulators with Extra‐Wide Bandgaps
Author(s) -
Chen Yafeng,
Meng Fei,
Jia Baohua,
Li Guangyao,
Huang Xiaodong
Publication year - 2019
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201900175
Subject(s) - topology (electrical circuits) , topological insulator , photonics , photonic crystal , realization (probability) , physics , inverse , dipole , point reflection , optoelectronics , quantum mechanics , mathematics , condensed matter physics , geometry , statistics , combinatorics
An intelligent approach for inversely designing topological photonic crystals (PCs) with time‐reversal symmetry (TRS) at any desired frequency is presented. By accurately controlling the frequencies of dipolar and quadrupolar modes, PCs with double Dirac cones and their band inversion are successfully realized through topology optimization. Novel patterns for topological trivial and nontrivial PCs with extra‐wide bandgaps are created for the realization of spin‐locked unidirectional propagation and robust transport of topological edge states. The systematic design reveals the evolution of the geometry of dielectric materials within unit cells of topological trivial and nontrivial PCs from low to high frequencies. Finally, the geometric rules of topological trivial and nontrivial PCs are extracted and analyzed for the ease of design and fabrication.