Photonic Square‐Root Second‐Order Topological Bound States in the Continuum
Wenchao Yan,
Weizhao Cheng,
Quancheng Liu
et al.
Abstract:Second‐order topological bound states in the continuum (SOTBICs) have received widely attention in photonics due to theirs counterintuitive localized properties. A model of square‐root SOTBICs is proposed that not only inherit topological features from its parent Hamiltonian, but also support multiple corner states with different propagation constants, a unique feature not found in its parent Hamiltonian. Using femtosecond laser‐writing technology, a photonic nontrivial 2D edge‐centered SSH lattice is fabricat… Show more
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