Abstract
The emerging perfect-absorber metamaterials (PAMs) provide an alternative
material approach for the next generation of electromagnetic detection at any
frequency band of interest. One type of dual cross-shaped PAMs is developed to
obtain multiplex-band spectrum absorption at mid-infrared region. Three distinct
absorption peaks are attributed to the polarization sensitivity excitation of the
plasmonic resonance. The charge density distributions, which are excited by resonant
electromagnetic waves passing through the PAMs medium, provide insights into the
observed absorption behavior. We find that the retrieved optical properties of the
PAMs including permittivity and permeability are still consistent with the sum of
the Drude and Lorentz type models at wavelengths ranging from 2.0 to 10.0 mm. Such
multiplex-band absorption properties enable the proposed PAMs a powerful tool for
the direct detection of multiple molecular vibrational structures, and for multiple
spectra infrared detection.
© 2014 Chinese Optics Letters
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