Journal ArticleDOI
Tunable one-way cross-waveguide splitter based on gyromagnetic photonic crystal
Cheng He,Xiao-Lin Chen,Ming-Hui Lu,Xue-Feng Li,Weiwei Wan,Xiaoshi Qian,Ruo-Cheng Yin,Yan-Feng Chen +7 more
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TLDR
In this paper, a tunable one-way cross-waveguide splitter was proposed, resulting from the broken time-reversal symmetry, based on the edge modes of gyromagnetic photonic crystal.Abstract:
We report our design of a tunable one-way cross-waveguide splitter, resulting from the broken time-reversal symmetry, based on the edge modes of gyromagnetic photonic crystal. Mode control is accomplished by altering the radius or refractive index of a single central electro-optical rod. The on-off switch of the channels can be manipulated by external electric or magnetic field. Coupled-mode theory between defect modes and waveguide modes was used to characterize the transmission efficiency of the channels.read more
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Topological Photonics
Tomoki Ozawa,Hannah M. Price,Alberto Amo,Nathan Goldman,Mohammad Hafezi,Ling Lu,Mikael C. Rechtsman,David Schuster,Jonathan Simon,Oded Zilberberg,Iacopo Carusotto +10 more
TL;DR: Topological photonics is a rapidly emerging field of research in which geometrical and topological ideas are exploited to design and control the behavior of light as mentioned in this paper, which holds great promise for applications.
Journal ArticleDOI
Acoustic topological insulator and robust one-way sound transport
TL;DR: In this article, the acoustic analogue of a topological insulator is shown: a metamaterial exhibiting one-way sound transport along its edge, a graphene-like array of stainless-steel rods.
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Experimental Observation of Large Chern Numbers in Photonic Crystals.
Scott Skirlo,Ling Lu,Yuichi Igarashi,Yuichi Igarashi,Q. Yan,Q. Yan,John D. Joannopoulos,Marin Soljacic +7 more
TL;DR: Mic microwave transmission measurements in the bulk and at the edge of ferrimagnetic photonic crystals are performed to produce dispersion relations of the edge modes, whose number and direction match the Chern number calculations.
Journal ArticleDOI
Multimode One-Way Waveguides of Large Chern Numbers
TL;DR: A continuously tunable power splitter is demonstrated as a possible application of multimode one-way waveguides and quantum anomalous Hall phases in photonic crystals with large Chern numbers of 2, 3, and 4 are predicted.
Journal ArticleDOI
Topologically protected one-way edge mode in networks of acoustic resonators with circulating air flow
TL;DR: In this article, an acoustic topological structure was proposed by creating an effective gauge magnetic field for sound using circularly flowing air in the designed acoustic ring resonators. But topological states cannot be simply reproduced due to the absence of similar magnetics-related sound-matter interactions in naturally available materials.
References
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The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ
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Quantal phase factors accompanying adiabatic changes
TL;DR: In this article, it was shown that the Aharonov-Bohm effect can be interpreted as a geometrical phase factor and a general formula for γ(C) was derived in terms of the spectrum and eigen states of the Hamiltonian over a surface spanning C.
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Observation of unidirectional backscattering-immune topological electromagnetic states
TL;DR: It is demonstrated that, like their electronic counterparts, electromagnetic CESs can travel in only one direction and are very robust against scattering from disorder; it is found that even large metallic scatterers placed in the path of the propagating edge modes do not induce reflections.
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Possible realization of directional optical waveguides in photonic crystals with broken time-reversal symmetry.
TL;DR: It is shown how, in principle, to construct analogs of quantum Hall edge states in "photonic crystals" made with nonreciprocal (Faraday-effect) media that form "one-way waveguides" that allow electromagnetic energy to flow in one direction only.