We report that equidistant 1D arrays of thin-film lithium niobate nano-waveguides generically support topological edge states. Unlike conventional coupled-waveguide topological systems, the topological properties of these arrays are dictated by the interplay between intra- and inter-modal couplings of two families of guided modes with different parities. Exploiting two modes within the same waveguide to design a topological invariant allows us to decrease the system size by a factor of two and substantially simplify the structure. We present two example geometries where topological edge states of different types (based on either quasi-TE or quasi-TM modes) can be observed within a wide range of wavelengths and array spacings.

Original languageEnglish
Pages (from-to)1982-1985
Number of pages4
JournalOptics Letters
Issue number8
Publication statusPublished - 3 Apr 2023

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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