Through systematically manipulating the couplings in the photonic lattice, the topological nature emerges associated with edge state dynamics. Here, we demonstrate a robust photonic zero mode sustained by a spatial non-Hermitian phase transition in a parity-time (PT) symmetric lattice despite the same topological order across the entire system and a flexible topological photonic lattice with multiple topologically nontrivial dispersion bands. Heterodyne measurements clearly reveal the ultrafast transport dynamics and energy of the edge states at a femtosecond scale, validating the designed topological features.

Date Published: 9 September 2019
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Proc. SPIE 11081, Active Photonic Platforms XI, 110810F (9 September 2019); doi: 10.1117/12.2526795

Published in SPIE Proceedings Vol. 11081:
Active Photonic Platforms XI
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)