Fano resonance from a one-dimensional topological photonic crystal
Linpeng Gu, Binbin Wang, Qingchen Yuan, Liang Fang, Qiang Zhao, Xuetao Gan, Jianlin Zhao
Abstract
An ultra-compact one-dimensional topological photonic crystal (1D-TPC) is designed in a single mode silicon bus-waveguide to generate Fano resonance lineshape. The Fano resonance comes from the interference between the discrete topological boundary state of the 1D-TPC and the continuum high-order leaky mode of the bus-waveguide. Standalone asymmetric Fano resonance lineshapes are obtained experimentally in the waveguide transmission spectrum with a maximum extinction ratio of 33 dB and a slope ratio of 10 dB/nm over a broadband flat background.
Topics & Concepts
Fano resonanceFano planePhotonic crystalResonance (particle physics)PhysicsTopology (electrical circuits)WaveguideInterference (communication)OpticsExtinction ratioGuided-mode resonanceBroadbandOptoelectronicsAtomic physicsTelecommunicationsGeometryPlasmonMathematicsComputer scienceWavelengthDiffraction gratingChannel (broadcasting)CombinatoricsPhotonic Crystals and ApplicationsTopological Materials and PhenomenaMetamaterials and Metasurfaces Applications