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  • 1.
    El Hassan, Ashraf
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Kunst, Flore K.
    Stockholm University, Faculty of Science, Department of Physics.
    Moritz, Alexander
    Stockholm University, Faculty of Science, Department of Physics.
    Andler, Guillermo
    Stockholm University, Faculty of Science, Department of Physics.
    Bergholtz, Emil J.
    Stockholm University, Faculty of Science, Department of Physics.
    Bourennane, Mohamed
    Stockholm University, Faculty of Science, Department of Physics.
    Corner states of light in photonic waveguides2019In: Nature Photonics, ISSN 1749-4885, E-ISSN 1749-4893, Vol. 13, no 10, p. 697-700Article in journal (Refereed)
    Abstract [en]

    The recently established paradigm of higher-order topological states of matter has shown that not only edge and surface states(1,2) but also states localized to corners, can have robust and exotic properties(3-9). Here we report on the experimental realization of novel corner states made out of visible light in three-dimensional photonic structures inscribed in glass samples using femtosecond laser technology(10,11). By creating and analysing waveguide arrays, which form two-dimensional breathing kagome lattices in various sample geometries, we establish this as a platform for corner states exhibiting a remarkable degree of flexibility and control. In each sample geometry we measure eigenmodes that are localized at the corners in a finite frequency range, in complete analogy with a theoretical model of the breathing kagome(7-9,12-14). Here, measurements reveal that light can be 'fractionalized,' corresponding to simultaneous localization to each corner of a triangular sample, even in the presence of defects.

  • 2.
    Mohamed El Hassan, Ashraf
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Kunst, Flore
    Stockholm University, Faculty of Science, Department of Physics.
    Moritz, Alexander
    Stockholm University, Faculty of Science, Department of Physics.
    Andler, Guillermo
    Stockholm University, Faculty of Science, Department of Physics.
    Bergholtz, Emil
    Stockholm University, Faculty of Science, Department of Physics.
    Bourennane, Mohamed
    Stockholm University, Faculty of Science, Department of Physics.
    Corner state of light in photonic waveguides2018In: Article in journal (Refereed)
1 - 2 of 2
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