Nonlinear control of photonic higher-order topological bound states in the continuum

作     者：Zhichan Hu Domenico Bongiovanni Dario Jukić Ema Jajtić Shiqi Xia Daohong Song Jingjun Xu Roberto Morandotti Hrvoje Buljan Zhigang Chen Zhichan Hu;Domenico Bongiovanni;Dario Juki?;Ema Jajti?;Shiqi Xia;Daohong Song;Jingjun Xu;Roberto Morandotti;Hrvoje Buljan;Zhigang Chen

作者机构：The MOE Key Laboratory of Weak-Light Nonlinear PhotonicsTEDA Applied Physics Institute and School of PhysicsNankai University300457TianjinChina INRS-EMT1650 Boulevard Lionel-BouletVarennesQCJ3X 1S2Canada Faculty of Civil EngineeringUniversity of ZagrebA.Kačića Miošića 2610000ZagrebCroatia Department of PhysicsFaculty of ScienceUniversity of ZagrebBijenička c.3210000ZagrebCroatia Collaborative Innovation Center of Extreme OpticsShanxi University030006TaiyuanShanxiChina Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of China610054ChengduSichuanChina Department of Physics and AstronomySan Francisco State UniversitySan FranciscoCA94132USA 

出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)

年 卷 期：2021年第10卷第9期

页      面：1726-1735页

核心收录：

学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学] 

基　　金：This research is supported by the National Key R&D Program of China under Grant No.2017YFA0303800 the National Natural Science Foundation(11922408,91750204,11674180) PCSIRT,and the 111 Project(No.B07013)in China D.B.acknowledges support from the 66 Postdoctoral Science Grant of China D.J.and H.B.acknowledge support in part by the Croatian Science Foundation Grant No.IP-2016-06-5885 SynthMagIA and the QuantiXLie Center of Excellence,a project co-financed by the Croatian Government and European Union through the European Regional Development Fund-the Competitiveness and Cohesion Operational Programme(Grant KK.01.1.1.01.0004) 

主　　题：topological nonlinearity nonlinear 

摘      要：Higher-order topological insulators(HOTIs)are recently discovered topological phases,possessing symmetry-protected corner states with fractional *** unexpected connection between these states and the seemingly unrelated phenomenon of bound states in the continuum(BICs)was recently *** nonlinearity is added to the HOTI system,a number of fundamentally important questions *** 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 *** we unveil the interplay of nonlinearity,higher-order topology,and BICs in a photonic *** 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 ***,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 *** studies are applicable to other nonlinear HOTI systems,with promising applications in emerging topology-driven devices.