FDTD simulations of tetrameric metamolecules (particle diameter, 80 nm; gap size, 2 nm) were carried out using Lumerical FDTD solutions (Lumerical Solutions, Canada). Optical constant data for gold were taken from Johnson and Christy (40). Linear polarized light was injected with a total-field/scattered-field source. Convergence was reached for a mesh size of 0.4 nm around the plasmonic particles. The follow-up data processing is constructed using MATLAB.

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