Impact of Transforming Interface Geometry on Edge States in Valley Photonic Crystals

D. Yu, S. Arora, L. Kuipers

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

We investigate how altering the interface geometry from a zigzag to a glide plane interface between two topologically distinct valley Hall emulating photonic crystals (VPC), profoundly affects edge states. We experimentally observe a transition from gapless to gapped edge states, accompanied by the occurrence of slow light within the Brillouin zone, rather than at its edge. We numerically simulate the propagation and measure the transmittance of the modified edge states through a specially designed valley-conserving defect. The robustness to backscattering gradually decreases, suggesting a disruption of valley-dependent transport. We demonstrate the significance of interface geometry to gapless edge states in a VPC.

Original languageEnglish
Article number116901
Number of pages6
JournalPhysical review letters
Volume132
Issue number11
DOIs
Publication statusPublished - 2024

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