Perfect absorber with separated 'dielectric–metal–ground' metamaterial structure. (15th March 2021)

• Record Type: Journal Article
• Authors: Wang, Han; Yan, Bo; Jin, Huizhen; Wang, Zhigang; Guo, Lanjun; Li, Boyan; Yu, Bo; Gong, Cheng
• Is Part Of: Journal of physics. Volume 54:Number 22(2021)
• Publication Date: 2021-03-15
• Subjects: metamaterial -- millimeter-wave -- absorber -- bi-material microcantilevers; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/abe901
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: A metamaterial perfect absorber whose effective thickness is less than 1/1000 of the operating wavelength is proposed. Different from the traditional 'metal–dielectric–ground' type metamaterial absorber, it adopts a novel 'dielectric–metal–ground' structure, and the 'dielectric–metal' structure is separated from the 'ground'. Through this design, the effective thickness of the absorber is reduced to about 1/2200 of the wavelength. This will make the absorber suitable for imaging and sensing applications. Next, a bi-material cantilever absorber based on the proposed structure is designed and fabricated to demonstrate the high absorption properties in the case of ultra-thin thickness. In addition, a reflective spectroscopy system based on a vector network analyzer is built to test the absorption performance. The measured results, showing that it has an absorptivity of close to 97% at 94 GHz, are in good agreement with simulations.