Layered Photonic Topological Insulators

Abstract

The recent realization of photonic topological insulators has brought the discovery of fundamentally new states of light and revolutionary applications such as non-reciprocal devices for photonic diodes and robust waveguides for light routing. The spatially distinguished layer pseudospin has attracted attention in two-dimensional electronic materials. Here we report layered photonic topological insulators based on all-dielectric bilayer photonic crystal slabs. The introduction of layer pseudospin offers more dispersion engineering capability, leading to the layer-polarized and layer-mixed photonic topological insulators. Their phase transition is demonstrated with a model Hamiltonian by considering the nonzero interlayer coupling. Layer-direction locking behavior is found in layer-polarized photonic topological insulators. High transmission is preserved in the bilayer domain wall between two layer-mixed photonic topological insulators, even when a large defect is introduced. Layered photonic topological insulators not only offer a route towards the observation of richer nontrivial phases, but also open a way for device applications in integrated photonics and information processing by using the additional layer pseudospin.

arXiv comment16 pages, 5 figures

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Cited by in corpus (9)

• Topological photonic crystals: physics, designs and applications
• A brief review of topological photonics in one, two, and three dimensions
• Topological metasurface: From passive toward active and beyond
• Interlayer Topological Transport and Devices based on Layer Pseudospins in Photonic Valley-Hall Phases
• Higher-order valley vortices enabled by synchronized rotation in a photonic crystal
• Fourier modal method for Moiré lattices
• Twist-tunable moiré optical resonances
• Experimental probe of band structures of bilayer valley photonic crystals
• Resonant mode coupling approximation for calculation of optical spectra of photonic crystal slabs. Part II