The scattering calculations were performed using a commercial finite-difference time-domain (FDTD) method software package (Lumerical FDTD Solutions 8.16.1022). The MOF-coated Al particles were modeled as concentric spheres placed on a SiO2 substrate. The diameter of the Al core, the thickness of the Al2O3 layer, and the thickness of the MOF layer were chosen to be 120, 3, and 30 nm, respectively. A total-field scattered-field light source was used to simulate a plane wave with a 60° incident angle. The collected scattering was calculated by first calculating the far-field scattering of the particle in the air side and then integrating the scattering intensity between the minimum (15°) and maximum (40°) collection angles. To account for the unpolarized light used in the experiment, we obtained the final scattering spectrum by averaging the scattering spectrums calculated from four different polarization angles: 0° (p polarization), 90° (s polarization), 45°, and −45°. The dielectric responses of Al, Al2O3, and SiO2 were taken from tabulated data (41, 16).

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