Nontrivial coupling of light into a defect: the interplay of nonlinearity and topology

Shiqi Xia; Dario Jukić; Nan Wang; Daria Smirnova; Lev Smirnov; Liqin Tang; Daohong Song; Alexander Szameit; Daniel Leykam; Jingjun Xu; Zhigang Chen; Hrvoje Buljan

doi:10.1038/s41377-020-00371-y

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Nontrivial coupling of light into a defect: the interplay of nonlinearity and topology

Original Articles

- Nontrivial coupling of light into a defect: the interplay of nonlinearity and topology
- Light: Science & Applications Vol. 9, Issue 5, Pages: 1417-1426(2020)
- Affiliations：
  
  1.The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin 300457, China
  2.Faculty of Civil Engineering, University of Zagreb, A. Kačića Miošića 26, 10000 Zagreb, Croatia
  3.Nonlinear Physics Centre, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
  4.Institute of Applied Physics, Russian Academy of Science, Nizhny Novgorod 603950, Russia
  5.Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006 Shanxi, PR China
  6.Institut für Physik, Universität Rostock, Albert-Einstein-Strasse 23, 18059 Rostock, Germany
  7.Center for Theoretical Physics of Complex Systems, Institute for Basic Science (IBS), Daejeon 34126, Republic of Korea
  8.Basic Science Program, Korea University of Science and Technology, Daejeon 34113, Republic of Korea
  9.Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132, USA
  10.Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32, 10000 Zagreb, Croatia
- Author bio：
  
  Daohong Song (songdaohong@nankai.edu.cn)
  Zhigang Chen (zgchen@nankai.edu.cn)
  Hrvoje Buljan (hbuljan@phy.hr)
- Funds：
- DOI：10.1038/s41377-020-00371-y
  CLC：
- Published：2020，
  
  Published Online：19 August 2020，
  
  Received：01 April 2020，
  
  Revised：25 June 2020，
  
  Accepted：04 July 2020
- Accepted：
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Xia, S. Q. et al. Nontrivial coupling of light into a defect: the interplay of nonlinearity and topology. Light: Science & Applications, 9, 1417-1426 (2020).
DOI：

Xia, S. Q. et al. Nontrivial coupling of light into a defect: the interplay of nonlinearity and topology. Light: Science & Applications, 9, 1417-1426 (2020). DOI： 10.1038/s41377-020-00371-y.

摘要

Abstract

The flourishing of topological photonics in the last decade was achieved mainly due to developments in linear topological photonic structures. However

when nonlinearity is introduced

many intriguing questions arise. For example

are there universal fingerprints of the underlying topology when modes are coupled by nonlinearity

and what can happen to topological invariants during nonlinear propagation? To explore these questions

we experimentally demonstrate nonlinearity-induced coupling of light into topologically protected edge states using a photonic platform and develop a general theoretical framework for interpreting the mode-coupling dynamics in nonlinear topological systems. Performed on laser-written photonic Su-Schrieffer-Heeger lattices

our experiments show the nonlinear coupling of light into a nontrivial edge or interface defect channel that is otherwise not permissible due to topological protection. Our theory explains all the observations well. Furthermore

we introduce the concepts of inherited and emergent nonlinear topological phenomena as well as a protocol capable of revealing the interplay of nonlinearity and topology. These concepts are applicable to other nonlinear topological systems

both in higher dimensions and beyond our photonic platform.

关键词

Keywords

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