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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From Photonic Crystals to Seismic Metamaterials: A Review via Phononic Crystals and Acoustic Metamaterials
TL;DR: In this paper, the authors discuss the historical context, current progresses and possible future outcomes of metamaterials and highlight the interesting phenomena observed in optics/electromagnetic metammaterials with acoustic and elastic counterparts.
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Photonic amorphous topological insulator.
Peiheng Zhou,Gui-Geng Liu,Xin Ren,Yihao Yang,Haoran Xue,Lei Bi,Longjiang Deng,Yidong Chong,Baile Zhang +8 more
TL;DR: By tuning the disorder strength in the lattice, it is demonstrated that photonic topological edge states can persist into the amorphous regime prior to the glass-to-liquid transition, paving the way for new classes of non-crystalline topological photonic bandgap materials.
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Active Nanophotonics
Alex Krasnok,Andrea Alù +1 more
TL;DR: Recent efforts in enabling active nanodevices for lasing and optical sources, loss compensation, and to realize new optical functionalities, like symmetry, exceptional points, and nontrivial lasing based on suitably engineered distributions of gain and loss in nanostructures are reviewed.
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Stability of topologically protected edge states in nonlinear fiber loops
TL;DR: In this article, the existence and stability of symmetry-protected topological chiral edge states in an all-photonic system mimicking the Floquet dynamics of a discrete one-dimensional quantum walk in the presence of Kerr nonlinearity was studied.
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Topologically protected excitons in porphyrin thin films.
TL;DR: In this paper, it was theoretically shown that metalloporphyrin layers support topological edge states that allow exciton currents even in disordered molecular lattices, and it was shown that these edge states can be used for exciton transport in organic materials.
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
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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.