Polarization sensitivity contributes to multiple band spectra of one mid-infrared absorber
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.
Binbin Wang：Key Laboratory of Micro/Nano Systems for Aerospace of Ministry of Education, Northwestern Polytechnical University, Xi'an 710072, China
Xiaolun Xu：Key Laboratory of Micro/Nano Systems for Aerospace of Ministry of Education, Northwestern Polytechnical University, Xi'an 710072, China
Lei Su：Key Laboratory of Micro/Nano Systems for Aerospace of Ministry of Education, Northwestern Polytechnical University, Xi'an 710072, China
备注：This work was supported by the National Natural Science Foundation of China (No. 51175436), the Aeronautical Science Foundation of China (No. 2012ZC53036), the Northwestern Polytechnical University Foundation for Fundamental Research (No. NPU-FFR-JC200811), and the 111 Projects from Chinese Ministry of Education (No. B13044).
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