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Updated: Jan 25, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
Broadband Topological Slow Light through Higher Momentum-Space Winding
Jonathan Guglielmon1, Mikael C Rechtsman1
1Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Abstract:
Slow-light waveguides can strongly enhance light-matter interaction, but suffer from a narrow bandwidth, increased backscattering, and Anderson localization. Edge states in photonic topological insulators resist backscattering and localization, but typically cross the bulk band gap over a single Brillouin zone, meaning that slow group velocity implies narrow-band operation. Here we show theoretically that this can be circumvented via an edge termination that causes the edge state to wind many times around the Brillouin zone, making it both slow and broadband.
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