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(a) Extinction spectra of the samples A1 and B1 in perpendicular (transverse) and parallel (longitudinal) polarizations; (b) DDA calculation of the extinction cross section of a smooth unit cell reproduced infinitely using periodic boundary conditions (width: 110 nm, length: 120 nm; height: 40 nm), in both polarizations. Note that the extinction cross section is indicated in nm2 per unit cell (length 120 nm).
