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- Title
Accidental Double Dirac Cones and Robust Edge States in Topological Anisotropic Photonic Crystals.
- Authors
Chen, Xiao‐Dong; Deng, Wei‐Min; Zhao, Fu‐Li; Dong, Jian‐Wen
- Abstract
Dirac cones in photonic systems have many profound applications such as achieving zero‐index materials and nontrivial photonic phases. It is shown that double Dirac cones at the zone boundary can be restored by achieving accidental degeneracy between transverse electric and transverse magnetic modes in 2D photonic crystals with anisotropic permittivity. The topological band gap can be obtained by lifting nontrivial double Dirac cones, each of which is formed by two orthogonally polarized linear branches sharing the same mirror parities. Robust transport of gapless and high transmission of gapped edge states are also demonstrated in topological anisotropic photonic crystals, demonstrating that a high transmission flat‐top spectrum is observed in various working frequency regions even when the interface is no longer straight. This may pave the way to a paradigm for a bandwidth‐controllable robust waveguide in topological photonics. Double Dirac cones at the zone boundary are restored in 2D anisotropic photonic crystals by achieving accidental degeneracy between transverse electric and transverse magnetic modes. Robust transport of gapless edge states is also demonstrated in topological anisotropic photonic crystals, which are obtained by lifting nontrivial double Dirac cones.
- Subjects
PHOTONIC crystals; TOPOLOGY; ANISOTROPY; PHOTONIC band gap structures; PERMITTIVITY
- Publication
Laser & Photonics Reviews, 2018, Vol 12, Issue 11, pN.PAG
- ISSN
1863-8880
- Publication type
Article
- DOI
10.1002/lpor.201800073