Abstract
Photonic topological insulators are a promising photonic platform due to the possibility of unidirectional edge states with insensitivity to bending, fabrication imperfections or environmental fluctuation. Here we demonstrate highly efficient unidirectional photonic edge mode propagation facilitated by an optical analogue of the quantum valley Hall effect. With an all-dielectric kagome lattice design, we demonstrate broadband suppressed reflection in the presence of sharp corners and further show negligible vertical losses in a semiconductor-based device at telecommunication wavelengths.
Highlights
When propagating in a material or waveguide, not all of the light travels in this initial direction but parts of it experience such back-reflection due to bending, fabrication defects, or environmental variations
We demonstrate highly efficient unidirectional photonic edge mode propagation facilitated by an optical analog of the quantum valley Hall effect
Degeneracies in order to obtain a nontrivial topological and complete photonic band gap [13], there is an inherent problem
Summary
Stephan Wong,1,2,* Matthias Saba, Ortwin Hess, and Sang Soon Oh 1,† 1School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, United Kingdom 2The Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom. Compared to the QVHE designs of triangular-like holes/rods array and staggered honeycomb structures, the proposed perturbed kagome lattice requires a single monodisperse type of circular holes/rods and is easier fabricated. It is this simplicity of the kagome-based design in terms of fabrication and its unidirectional edge mode transport which makes it an ideal candidate for practical applications at near-infrared and visible wavelengths. We present and model the predicted behavior for an on-chip platform that can be readily fabricated with state-of-the-art semiconductor growth techniques [29]
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