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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Dimensional hierarchy of higher-order topology in three-dimensional sonic crystals.
Xiujuan Zhang,Biye Xie,Hong-Fei Wang,Xiangyuan Xu,Xiangyuan Xu,Yuan Tian,Jian-Hua Jiang,Ming-Hui Lu,Yan-Feng Chen +8 more
TL;DR: In this paper, the authors report the experimental discovery of a hierarchy of topologically protected 2D surface states, 1D hinge states and 0D corner states in a single 3D system by using higher-order topological sonic crystals.
Journal ArticleDOI
Inverse design of photonic topological state via machine learning
TL;DR: This work focuses on Zak phases, which are the topological properties of one-dimensional photonics crystals, and proposes an approach to achieve the design of optical structures with the target topological states by exploiting machine learning technologies.
Journal ArticleDOI
Probing the Band Structure of Topological Silicon Photonic Lattices in the Visible Spectrum.
Siying Peng,Nick Schilder,Xiang Ni,Jorik van de Groep,Mark L. Brongersma,Andrea Alù,Alexander B. Khanikaev,Harry A. Atwater,Albert Polman +8 more
TL;DR: Optical transmission spectroscopy shows evidence of topological edge states at the domain walls between topological and trivial lattices in hexagonal photonic lattices of silicon Mie resonators.
Journal ArticleDOI
Topological magnetoplasmon
Dafei Jin,Ling Lu,Zhong Wang,Chen Fang,John D. Joannopoulos,Marin Soljacic,Liang Fu,Nicholas X. Fang +7 more
TL;DR: In this paper, it was shown that the two-dimensional magnetoplasmon, which bears gapped bulk states and gapless one-way edge states near zero frequency, is topologically analogous to the 2D topological topological superconductor with chiral Majorana edge states and zero modes.
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Deep-Subwavelength Holey Acoustic Second-Order Topological Insulators
Zhiwang Zhang,Zhiwang Zhang,Houyou Long,Chen Liu,Chen Shao,Ying Cheng,Xiaojun Liu,Johan Christensen +7 more
TL;DR: A holey HOTI capable of sustaining deeply confined corner states 50 times smaller than the wavelength is proposed, which will have the capability to push forward exciting applications for robust acoustic imaging way beyond the diffraction limit.
References
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Colloquium: Topological insulators
M. Z. Hasan,Charles L. Kane +1 more
TL;DR: In this paper, the theoretical foundation for topological insulators and superconductors is reviewed and recent experiments are described in which the signatures of topologically insulators have been observed.
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Topological insulators and superconductors
Xiao-Liang Qi,Shou-Cheng Zhang +1 more
TL;DR: Topological superconductors are new states of quantum matter which cannot be adiabatically connected to conventional insulators and semiconductors and are characterized by a full insulating gap in the bulk and gapless edge or surface states which are protected by time reversal symmetry.
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Negative Refraction Makes a Perfect Lens
TL;DR: The authors' simulations show that a version of the lens operating at the frequency of visible light can be realized in the form of a thin slab of silver, which resolves objects only a few nanometers across.
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The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ
Journal ArticleDOI
Experimental Verification of a Negative Index of Refraction
TL;DR: These experiments directly confirm the predictions of Maxwell's equations that n is given by the negative square root ofɛ·μ for the frequencies where both the permittivity and the permeability are negative.