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

Journal Article (2024)
Author(s)

D. Yu (Kavli institute of nanoscience Delft, Student TU Delft)

S. Arora (Student TU Delft, Kavli institute of nanoscience Delft)

Kobus Kuipers (TU Delft - QN/Quantum Nanoscience, Kavli institute of nanoscience Delft)

Department
QN/Quantum Nanoscience
DOI related publication
https://doi.org/10.1103/PhysRevLett.132.116901
More Info
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Publication Year
2024
Language
English
Department
QN/Quantum Nanoscience
Issue number
11
Volume number
132
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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.

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