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

Journal article (2024)

Authors

D. Yu Student, Kavli institute of nanoscience Delft
S. Arora Kavli institute of nanoscience Delft, Student
L. Kuipers Kavli institute of nanoscience Delft, QN/Quantum Nanoscience
Department
QN/Quantum Nanoscience
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Published Date

2024

Language

English

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Department

QN/Quantum Nanoscience

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.