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We present a modal analysis of metal-insulator-metal (MIM) basedmetamaterials in the far infrared region. These structures can be used asresonant reflection bandcut spectral filters that are independent of thepolarization and direction of incidence because of the excitation of quasimodes(modes associated with a complex frequency) leading to quasi-total absorption.We fabricated large area samples made of chromium nanorod gratings on top ofSi/Cr layers deposited on silicon substrate and measurements by FourierTransform spectrophotometry show good agreement with finite elementsimulations. A quasimodal expansion method is developed to obtain a reducedorder model that fits very well full wave simulations and that highlightsexcitation conditions of the modes.

Resonant metamaterial absorbers for infrared spectral filtering: quasimodal analysis, design, fabrication and characterization