Topological one-way large-area waveguide states in magnetic photonic crystals

Abstract

We have theoretically and experimentally achieved large-area one-way transport by using heterostructures consisting of a domain of an ordinary photonic crystal (PC) sandwiched between two domains of magnetic PCs. The non-magnetized domain carries two orthogonal one-way waveguide states which have amplitude uniformly distributed over a large-area. These two waveguide states support unidirectional transport even though the medium of propagation is not magnetized. We show both experimentally and numerically that such one-way waveguide states can be utilized to abruptly narrow the beam width of an extended state to concentrate energy. Such extended waveguide modes are robust to different kinds of defects, such as voids and PEC barriers. They are also immune to the Anderson type localization when large randomness is introduced.

12 pages, 5 figures

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• Topological photonic alloy
• Chiral photonic topological states in Penrose quasicrystals
• Topological Edge Mode Tapering
• Observation of gapless corner modes in synthetic translation dimensions
• Realization of broadband index-near-zero modes in nonreciprocal magneto-optical heterostructures
• Band alignment effect in the topological photonic alloy
• Antichiral edge states and Bogoliubov Fermi surfaces in a two-dimensional proximity-induced superconductor
• Magnetic doping-induced second-order and first-order topological phase transition inthe photonic alloy