Chinese Optics Letters, 2014, 12 (10): 101603, Published Online: Sep. 28, 2014  

Polarization sensitivity contributes to multiple band spectra of one mid-infrared absorber Download: 541次

Author Affiliations
Key Laboratory of Micro/Nano Systems for Aerospace of Ministry of Education, Northwestern Polytechnical University, Xi'an 710072, China
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.

Yongqian Li, Binbin Wang, Xiaolun Xu, Lei Su. Polarization sensitivity contributes to multiple band spectra of one mid-infrared absorber[J]. Chinese Optics Letters, 2014, 12(10): 101603.

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