High- Q Metasurface Absorber Enabled by Symmetry Breaking in a Plasmonic Lattice

) with tunable absorption by engineering symmetry-breaking-induced quasi-bound states in the continuum that are cooperatively coupled to surface lattice resonances in a plasmonic lattice. Moreover, the resonance wavelength is also tunable across the near-infrared (700-1700 nm) via simple parametric scaling. Here, we establish this strategy through temporal-coupled-mode-theory-based theoretical analysis, numerical simulation, and experimental validation.