  The absorption and extinction spectra of sub-wavelength cylinder arrays are
shown to present two different kind of resonances. Close to the Rayleigh
anomalies, the diffractive coupling with the lattice periodicity leads to sharp
peaks in the extinction spectra with characteristic Fano line shapes for both s
and p-polarizations. When the material exhibits an absorption line or in the
presence of localized surface plasmon/polaritons, the system is shown to
present resonant absorption with wider and symmetric line shapes. For
s-polarization our analysis predicts a theoretical limit of 50 % of absorption.
Interestingly, for p-polarized light and an appropriate choice of parameters,
subwavelength cylinder arrays can present perfect (100 %) absorption.
