@article{Beer2023,
   abstract = {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.},
   author = {Andrey V. Gorbach and Jesper Beer and Anton Souslov},
   doi = {10.1364/OL.485415},
   issn = {1539-4794},
   issue = {8},
   journal = {Optics Letters},
   keywords = {Array waveguide devices,Arrays,Lithium niobate,Waveguide design,Waveguide modes,Waveguides},
   month = {4},
   pages = {1982-1985},
   publisher = {Optica Publishing Group},
   title = {Topological edge states in equidistant arrays of lithium niobate nano-waveguides},
   volume = {48},
   url = {https://opg.optica.org/viewmedia.cfm?uri=ol-48-8-1982&seq=0&html=true https://opg.optica.org/abstract.cfm?uri=ol-48-8-1982 https://opg.optica.org/ol/abstract.cfm?uri=ol-48-8-1982},
   year = {2023}
}