Edge-Mode Lasing in 1D Topological Active Arrays

Midya Parto, Steffen Wittek, Hossein Hodaei, Gal Harari, Miguel A. Bandres, Jinhan Ren, Mikael C. Rechtsman, Mordechai Segev, Demetrios N. Christodoulides, Mercedeh Khajavikhan

Research output: Contribution to journalArticlepeer-review

347 Scopus citations


We report the first observation of lasing topological edge states in a 1D Su-Schrieffer-Heeger active array of microring resonators. We show that the judicious use of non-Hermiticity can promote single edge-mode lasing in such arrays. Our experimental and theoretical results demonstrate that, in the presence of chiral-time symmetry, this non-Hermitian topological structure can experience phase transitions that are dictated by a complex geometric phase. Our work may pave the way towards understanding the fundamental aspects associated with the interplay among non-Hermiticity, nonlinearity, and topology in active systems.

Original languageEnglish (US)
Article number113901
JournalPhysical review letters
Issue number11
StatePublished - Mar 15 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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