Ultra-thin broadband metamaterial absorber

• Published in: Applied physics. A, Materials science & processing Vol. 108; no. 1; pp. 19 - 24
• Main Authors: Liu, Yahong, Gu, Shuai, Luo, Chunrong, Zhao, Xiaopeng
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.07.2012; Springer
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Machines; Manufacturing; Nanotechnology; Optical and Electronic Materials; Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical materials; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Optics; Photonic bandgap materials; Physics; Physics and Astronomy; Processes; Rapid Communication; Surfaces and Interfaces; Thin Films; Absorption Bandwidth; Circular Patch; Broadband Absorption; Metallic Ground; Metamaterial Absorber; Dielectric materials; Measuring methods; Experimental study; TM mode; Absorption coefficients; TE mode; Close packing; Optical polarization; Manufacturing processes; Electromagnetic wave absorption; Bandwidth; Optical materials; Incidence angle; Metamaterial
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-012-6936-0

The design, fabrication, and measurements of a broadband metamaterial absorber are reported. The proposed metamaterial absorber consists of circular metallic patches and a metallic ground plane separated by a dielectric layer. Increasing the number of metallic patches can broaden the frequency range when their resonances are closely packed together, thereby resulting in a broadband resonance. Experimental results show that the proposed absorber has high absorptivity, with a full width at half maximum absorption bandwidth of 2.8 GHz and the relative FWHM absorption bandwidth of 25.3 %. In addition, the absorber can operate at a wide range of incident angles under both transverse electric and transverse magnetic polarizations.