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

Abstract

We present a modal analysis of metal-insulator-metal (MIM) based metamaterials in the far infrared region. These structures can be used as resonant reflection bandcut spectral filters that are independent of the polarization 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 of Si/Cr layers deposited on silicon substrate and measurements by Fourier Transform spectrophotometry show good agreement with finite element simulations. A quasimodal expansion method is developed to obtain a reduced order model that fits very well full wave simulations and that highlights excitation conditions of the modes.

8 pages, 7 figures

References in corpus (3)

• A Perfect Metamaterial Absorber
• A metamaterial absorber for the terahertz regime: Design, fabrication and characterization
• Quasimodal expansion of electromagnetic fields in open two-dimensionnal structures

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• A coupling model for quasi-normal modes of photonic resonators
• Completeness and divergence-free behavior of the quasi-normal modes using causality principle