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

Benjamin Vial (1, 2, 3) , Guillaume Demésy (2, 3) , Frédéric Zolla (2, 3) , André Nicolet (2, 3) , Mireille Commandre (1, 4) , Christophe Hecquet (5) , Thomas Begou (6) , Tisserand Stéphane (6) , Sophie Gautier (6) , Sauget Vincent (6)

1 MAP2
2 ATHENA - ATHENA
3 CLARTE - CLARTE
4 ILM - ILM
5 RCMO - RCMO
6 SILIOS - SILIOS Technologies

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. We show that this resonant reflection dip is due to the excitation of quasimodes (modes associated with a complex frequency) leading to quasi-total absorption. We have fabricated large area samples made of chromium nanorod gratings on top of Si/Cr layers deposited on silicon substrate. Measurements by Fourier transform spectrophotometry show good agreement with finite element simulations. A quasimodal expansion method is applied to obtain a minimal resonant model that fits well full wave simulations and that highlights excitation conditions of the modes.

Domaines: Optique [physics.optics]; Physique Numérique [physics.comp-ph]; Physique mathématique [math-ph]; Optique / photonique; Electromagnétisme

Benjamin Vial, Guillaume Demésy, Frédéric Zolla, André Nicolet, Mireille Commandre, et al.. Resonant metamaterial absorbers for infrared spectral filtering: quasimodal analysis, design, fabrication, and characterization. Journal of the Optical Society of America B, 2014, 31 (6), pp.1339-1346. ⟨10.1364/JOSAB.31.001339⟩. ⟨hal-01202794⟩