
1.The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, 300457, Tianjin, China
2.INRS-EMT, 1650 Boulevard Lionel-Boulet, Varennes, QC, J3X 1S2, Canada
3.Faculty of Civil Engineering, University of Zagreb, A. Kačića Miošića 26, 10000, Zagreb, Croatia
4.Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32, 10000, Zagreb, Croatia
5.Collaborative Innovation Center of Extreme Optics, Shanxi University, 030006, Taiyuan, Shanxi, China
6.Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, 610054, Chengdu, Sichuan, China
7.Department of Physics and Astronomy, San Francisco State University, San Francisco, CA, 94132, USA
Hrvoje Buljan (hbuljan@phy.hr)
Zhigang Chen (zgchen@nankai.edu.cn)
Published:30 September 2021,
Published Online:10 August 2021,
Received:27 May 2021,
Revised:26 July 2021,
Accepted:26 July 2021
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Hu, Z. C. et al. Nonlinear control of photonic higher-order topological bound states in the continuum. Light: Science & Applications, 10, 1726-1735 (2021).
Hu, Z. C. et al. Nonlinear control of photonic higher-order topological bound states in the continuum. Light: Science & Applications, 10, 1726-1735 (2021). DOI: 10.1038/s41377-021-00607-5.
Higher-order topological insulators (HOTIs) are recently discovered topological phases
possessing symmetry-protected corner states with fractional charges. An unexpected connection between these states and the seemingly unrelated phenomenon of bound states in the continuum (BICs) was recently unveiled. When nonlinearity is added to the HOTI system
a number of fundamentally important questions arise. For example
how does nonlinearity couple higher-order topological BICs with the rest of the system
including continuum states? In fact
thus far BICs in nonlinear HOTIs have remained unexplored. Here we unveil the interplay of nonlinearity
higher-order topology
and BICs in a photonic platform. We observe topological corner states that are also BICs in a laser-written second-order topological lattice and further demonstrate their nonlinear coupling with edge (but not bulk) modes under the proper action of both self-focusing and defocusing nonlinearities. Theoretically
we calculate the eigenvalue spectrum and analog of the Zak phase in the nonlinear regime
illustrating that a topological BIC can be actively tuned by nonlinearity in such a photonic HOTI. Our studies are applicable to other nonlinear HOTI systems
with promising applications in emerging topology-driven devices.
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