Frequency-dependent topological phases and photonic detouring in valley photonic crystals
arXiv:2005.08436 · doi:10.1103/PhysRevB.102.174202
Abstract
Here, the frequency degree of freedom is introduced into valley photonic crystals with dual band gaps. Based on the high-order plane wave expansion model, we derive an effective Hamiltonian which characterizes dual band gaps. Metallic valley photonic crystals are demonstrated as examples in which all four topological phases are found. At the domain walls between topologically distinct valley photonic crystals, frequency-dependent edge states are demonstrated and a broadband photonic detouring is proposed. Our findings provide the guidance for designing the frequency-dependent property of topological structures and show its potential applications in wavelength division multiplexers.
arXiv comment12 pages, 4 figures
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- Hybrid topological photonic crystals
- Multifrequency and multimode topological waveguides in a Stampfli-triangle photonic crystal with large valley Chern numbers
- Inverse design of dual-band valley-Hall topological photonic crystals with arbitrary pseudospin states
- Dynamic Phase Enabled Topological Mode Steering in Composite Su-Schrieffer-Heeger Waveguide Arrays