Fig. 2: Origins and analysis of the nodal rings.
From: Topological phononics arising from fluid-solid interactions
a Band structure of periodic metallic plates without perforations. b Distribution of the ideal type-II nodal ring for (a). No other nodal rings exist. c Band structure on the dashed loop denoted in (b). The radius of the circular loop is 0.1π/a0. Solid lines and hollow dots respectively denote the results from full-wave simulations and the effective Hamiltonian. d Evolution of the nodal rings, from uniform plates to plates with blind holes and finally through holes.
