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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Accidental degeneracy in photonic bands and topological phase transitions in two-dimensional core-shell dielectric photonic crystals.
TL;DR: It is shown that, without breaking time-reversal symmetry, by tuning the geometry of the core-shell material, a phase transition into the photonic quantum spin Hall insulator can be achieved.
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Photonic Weyl degeneracies in magnetized plasma
Wenlong Gao,Biao Yang,Mark Lawrence,Mark Lawrence,Fengzhou Fang,Benjamin Béri,Shuang Zhang,Shuang Zhang +7 more
TL;DR: The presence of a novel type of plasmonic Weyl points in a naturally existing medium—magnetized plasma, in which Weyl Points arise as crossings between purely longitudinal plasma modes and transverse helical propagating modes is reported.
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Fano-resonant metamaterials and their applications
TL;DR: Fano-resonant plasmonic metamaterials have been extensively studied in the literature as mentioned in this paper, focusing on the applications of such artificial electromagnetic materials to a variety of technologically important areas.
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Quantum simulation of 2D topological physics in a 1D array of optical cavities
TL;DR: The incredible value of orbital angular momentum of light for quantum simulation is demonstrated by showing theoretically how it allows to study a variety of important 2D topological physics in a 1D array of optical cavities.
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Non-Hermitian and topological photonics: optics at an exceptional point
Midya Parto,Yuzhou G. N. Liu,Babak Bahari,Mercedeh Khajavikhan,Mercedeh Khajavikhan,Demetrios N. Christodoulides +5 more
TL;DR: A recent overview of recent advancements in these emerging fields, with emphasis on photonic NH platforms, exceptional point dynamics, and the very promising interplay between non-Hermiticity and topological physics can be found in this paper.
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.