Topological edge states in equidistant arrays of lithium niobate nano-waveguides

Andrey V. Gorbach, Jesper Beer, Anton Souslov

Research output: Contribution to journalArticlepeer-review

3 Citations (SciVal)

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.

Original languageEnglish
Pages (from-to)1982-1985
Number of pages4
JournalOptics Letters
Volume48
Issue number8
DOIs
Publication statusPublished - 3 Apr 2023

Bibliographical note

Data availability
Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

Funding
Air Force Office of Scientific Research (FA8655-22-1-7028); Royal Society (RGS/R2/202135); Engineering and Physical Sciences Research Council (EP/T000961/1).

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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