Abstract
We demonstrate the first, to the best of our knowledge, experimental observation of higher-order topological corner states in the photonic two-dimensional (2D) trimer lattices. Using a femtosecond laser direct writing technology, we experimentally fabricate a series of 2D trimer lattices with different open boundary conditions and thereby observe two kinds of 0D topological corner states, i.e., topological corner states and topological defect corner states. Interestingly, these corner states and defect corner states can not only exist in the bandgap but also coexist with the bulk states and show obvious localization properties. This work provides fresh perspectives on higher-order topology in artificial microstructures.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Wenchao Yan, Weizhao Cheng, Weijie Liu, and Feng Chen
Opt. Lett. 48(7) 1802-1805 (2023)
Wenchao Yan, Weizhao Cheng, Weijie Liu, Quancheng Liu, and Feng Chen
Opt. Lett. 48(14) 3765-3768 (2023)
Xiaoxue Li, Guanghao Rui, Jun He, and Bing Gu
Opt. Lett. 48(20) 5332-5335 (2023)