Photonic topological insulators
Alexander B. Khanikaev,S. Hossein Mousavi,Wang-Kong Tse,Mehdi Kargarian,Allan H. MacDonald,Gennady Shvets +5 more
TLDR
It is shown that metacrystals-superlattices of metamaterials with judiciously designed properties-provide a platform for designing topologically non-trivial photonic states, similar to those identified for condensed-matter topological insulators.Abstract:
Recent progress in understanding the topological properties of condensed matter has led to the discovery of time-reversal-invariant topological insulators. A remarkable and useful property of these materials is that they support unidirectional spin-polarized propagation at their surfaces. Unfortunately topological insulators are rare among solid-state materials. Using suitably designed electromagnetic media (metamaterials) we theoretically demonstrate a photonic analogue of a topological insulator. We show that metacrystals-superlattices of metamaterials with judiciously designed properties-provide a platform for designing topologically non-trivial photonic states, similar to those that have been identified for condensed-matter topological insulators. The interfaces of the metacrystals support helical edge states that exhibit spin-polarized one-way propagation of photons, robust against disorder. Our results demonstrate the possibility of attaining one-way photon transport without application of external magnetic fields or breaking of time-reversal symmetry. Such spin-polarized one-way transport enables exotic spin-cloaked photon sources that do not obscure each other.read more
Citations
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Optimal quantum valley Hall insulators by rationally engineering Berry curvature and band structure
TL;DR: In this article, the optimal quantum valley Hall insulators with simple geometries, large relative operating bandwidths and highly localized interface modes can be obtained in a systematic way by formulating it to an optimization formulation.
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Non-Abelian Braiding of Light
TL;DR: This work demonstrates that non-Abelian Berry phases can arise when coherent states of light are injected into "topological guided modes" in specially fabricated photonic waveguide arrays, photonic analogues of topological zero modes in electronic systems.
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Effective magnetic fields for photons in waveguide and coupled resonator lattices
TL;DR: It is shown that an artificial magnetic field can be achieved by application of an index gradient and periodic lumped phase shifts or modulation of the propagation constants/resonances, without the need to modulate the coupling strength.
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Electromagnetic-Dual Metasurfaces for Topological States along a 1D Interface
TL;DR: In this article, the symmetry-protected topological states of the quantum spin-Hall effect can be realized in a straightforward manner by coupling surface modes over metasurfaces of complementary electromagnetic responses.
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P · T · D symmetry-protected scattering anomaly in optics
TL;DR: In this article, it is shown that there is a wide class of three-dimensional metamaterial platforms protected by a particular symmetry that guarantees bidirectional transport of light totally free of reflections, independent of the specific geometry of the propagation channel and other imperfections.
References
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Xiao-Liang Qi,Shou-Cheng Zhang +1 more
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Negative Refraction Makes a Perfect Lens
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The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ
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