Topological edge states in equidistant arrays of lithium niobate nano-waveguides
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 03, 2023
- Source ID
- 10.1364/ol.485415
Entities
People
- Andrey V. Gorbach
- Anton Souslov
- Jesper Beer
Organizations
- Air Force Office of Scientific Research
- Engineering and Physical Sciences Research Council
- Royal Society
- University of Bath