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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Invited Article: Topological crystalline protection in a photonic system
TL;DR: In this article, a mechanism to realize photonic boundary states topologically protected by crystalline symmetry is proposed, which maps a one-dimensional system to a two-dimensional lattice model with opposite magnetic fields, as well as opposite Chern numbers in its even and odd mirror parity subspaces, thus corresponding to a topological mirror insulator.
Journal ArticleDOI
Magnetic field assisted beam-scanning leaky-wave antenna utilizing one-way waveguide.
Lujun Hong,Lujun Hong,Yun You,Qian Shen,Qian Shen,Yazhou Wang,Yazhou Wang,Xing Liu,Hang Zhang,Chiaho Wu,Linfang Shen,Xiaohua Deng,Sanshui Xiao +12 more
TL;DR: The dispersion of the LWA is analyzed, showing the one-way feature and the radiation loss, and the main beam angle obtained by full-wave simulation is consistent with the theoretical prediction with the aid of the dispersion.
Book
Light Manipulation by Plasmonic Nanostructures
TL;DR: In this paper, the authors studied various effects related to the excitation of surface plasmons in different kinds of plasmonic nanostructures and proposed a new mechanism to achieve complete spectral gaps without periodicity along the propagation direction.
Journal ArticleDOI
Designing Topological Defect Lines Protected by Gauge-Dependent Symmetry Indicators
TL;DR: In this article , a rotational symmetry indicator is used to construct and characterize a topologically robust waveguide, which is then verified experimentally on a printed circuit board (PCB) platform.
Posted Content
Advances in Synthetic Gauge Fields for Light Through Dynamic Modulation.
Daniel R. Hey,Enbang Li +1 more
TL;DR: In this article, the authors reviewed dynamic modulation as a process for breaking the time-reversal symmetry of light and generating a synthetic gauge field, and discussed its role in topological photonics.
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.