The reflection spectra and corresponding field distributions were numerically calculated with a commercial finite element analysis software (COMSOL Multiphysics). In our numerical calculations, the whole structure was composed of TiO2 and settled on top of a 15-nm ITO-coated glass. The optical constant of TiO2 was determined from spectroscopic ellipsometry measurements. The dielectric constant of ITO was taken from (19). The glass substrate was considered as lossless with a refractive index of nsub = 1.52. To mimic the infinite large periodic sample, a periodic boundary condition was applied.

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