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| 1 | Nontrivial coupling of light into a defect:the interplay of nonlinearity and topology显示文摘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. | Shiqi Xia Dario Jukic Nan Wang Daria Smirnova Lev Smirnov Liqin Tang Daohong Song Alexander Szameit Daniel Leykam Jingjun Xu Zhigang Chen Hrvoje Buljan | 2020 | Light(Science & Applications)2020，9，1： | 3 |
| 2 | Special Issue on “Topological photonics and beyond:novel concepts and recent advances”显示文摘The discovery of topological phases and topological insulators has revolutionized several fields of natural science,including condensed matter physics,materials science,and photonics.Topological concepts have been implemented in a variety of materials and in a broad range of wave systems ranging from electronic,atomic,photonic,plasmonic,polaritonic,to microwave,acoustic,and mechanical waves. | Zhigang Chen Hrvoje Buljan Daniel Leykam | 2020 | Light(Science & Applications)2020，9，1： | 2 |
| 3 | Disorder-protected quantum state transmission through helical coupled-resonator waveguides显示文摘We predict the preservation of temporal indistinguishability of photons propagating through helical coupled-resonator optical waveguides(H-CROWs).H-CROWs exhibit a pseudospin-momentum locked dispersion,which we show suppresscs on-site disorder-induced backscattering and group velocity fluctuations.We simulate numerically the propagation of two-photon wave packets,demonstrating that they exhibit almost perfect Hong-Ou-Mandel dip visibility and then can preserve their quantum coherence even in the presence of moderate disorder,in contrast with regular CROws,which are highly sensitive to disorder.As indistinguishability is the most fundamental resource of quantum information processing,H-CROWs may find applications for the implementation of robust optical links and delay lines in the emerging quantum photonic communication and computational platforms. | JUNG YUN HAN ANDREY ASUKHORUKOV DANIEL LEYKAM | 2020 | Photonics Research2020，8，10： | 1 |
| 4 | Pseudospin-2 in photonic chiral borophene显示文摘Pseudospin is an angular momentum degree of freedom introduced in analogy to the real electron spin in the effective massless Dirac-like equation used to describe wave evolution at conical intersections such as the Dirac cones of graphene.Here,we study a photonic implementation of a chiral borophene allotrope hosting a pseudospin-2 conical intersection in its energy-momentum spectrum.The presence of this fivefold spectral degeneracy gives rise to quasiparticles with pseudospin up to±2.We report on conical diffraction and pseudospin-orbit interaction of light in photonic chiral borophene,which,as a result of topological charge conversion,leads to the generation of highly charged optical phase vortices. | PHILIP MENZ HAISSAM HANAFI DANIEL LEYKAM JÖRG IMBROCK CORNELIA DENZ | 2023 | Photonics Research2023，11，5： | 0 |
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