Applied Physics A

, Volume 102, Issue 1, pp 99-103

First online:

Perfect metamaterial absorber based on a split-ring-cross resonator

  • Yongzhi ChengAffiliated withCollege of Physical Science and Technology, Huazhong Normal University Email author 
  • , Helin YangAffiliated withCollege of Physical Science and Technology, Huazhong Normal University
  • , Zhengze ChengAffiliated withThe School of Electronic and Information Engineering, XianNing University
  • , Nan WuAffiliated withNational Key Laboratory of EMC, China Ship Development and Design Center

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In this paper, we present a polarization-insensitive metamaterial (MM) absorber which is composed of the dielectric substrate sandwiched with split-ring-cross resonator (SRCR) and continuous metal film. The MM absorber is not limited by the quarter-wavelength thickness and can achieve near-unity absorbance by properly assembling the sandwiched structure. Microwave experiments demonstrate the maximum absorptivity to be about 99% around 10.91 GHz for incident wave with different polarizations. The surface currents distributions of the resonance structure are discussed to look into the resonance mechanism. Importantly, our absorber is only 0.4 mm thick, and numerical simulations confirm that the MM absorber could achieve very high absorptivity at wide angles of incidence for both transverse electric (TE) wave and transverse magnetic (TM) wave. The sandwiched structure is also suitable for designing of a THz and even higher frequency MM absorber, and simulations demonstrate the absorption of 99% at 1.105 THz.