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Mie resonators as lattice resonant metasurfaces have the capability toproduce structural colour. However, design criteria for these metasurfaces arestill being investigated. In this work, we numerically examine how thetwo-dimensional nanostructure shape in a lattice array affects the colorimetricresponse of the metasurface under linearly polarised light excitation. First,the transformation from a square-shaped to rectangle-shaped nanostructure arrayresulted in polarisation-sensitive metasurfaces with colorimetric outputs boundalong a line on the CIE 1931 2-degree Standard Observer colour space. Thebounds of the colorimetry line were tuneable to any desired chromatic range.Second, the removal of the corners in square- or rectangle-shapednanostructures to create t-shaped nanostructure arrays displayed a dampeningeffect on the high-order resonance. Finally, we analytically determined thatthe colour saturation could increase when moving from rectangle-shaped tot-shaped nanostructure arrays. From these results, we present two designguidelines for lattice resonant metasurfaces: (1) Constructing thenanostructure to support fundamental resonances at different wavelengthsenables two-colour-bound movement when excited by successive angles of linearlypolarised light; (2) Removing portions of the nanostructure that only supporthigh-order resonances dampens these modes while maintaining support forfundamental resonances. These results present first-principles guidelines forengineering nanoparticles in lattice resonant metasurfaces, offering a newtoolbox for polarised-light sensing and colorimetric applications.

Cutting corners to suppress high-order modes in Mie resonator arrays