A Design for Band Enhanced Dielectric Absorber Based on Fractal-Like Structure
- 164 Downloads
A dielectric metamaterial absorber has been proposed, which consists of fractal-like structure and conductive sheet. The fractal-like structure is made by the high permittivity dielectric and also is covered by the conductive sheet. Absorptivity of such a dielectric metamaterial absorber is 99.1%, which can be found at 10.196 GHz; meanwhile, the absorber is polarization insensitive. To enhance the bandwidth of absorber, a novel absorber also is proposed, whose bandwidth is 0.566 GHz, which ranges from 9.752 to 10.318 GHz, and relative bandwidth is 5.64%. The maximum absorptivity can reach to 99.8%, and the proposed absorber also is polarization insensitive. In the meantime, the absorber shows excellent performance which is incident angle insensitive; when the incident angle is increased to 70°, the absorptivity is larger than 75%.
KeywordsDielectric metamaterial absorber Bandwidth enhanced Polarization insensitive Angle insensitive
Funding of Jiangsu Innovation Program for Graduate Education (KYLX16_0368); National Natural Science Foundation of China (Grant No.61671238); Chinese Jiangsu Planned Projects for Postdoctoral Research Funds (Grant No. 1501016A); Project Funded by China Postdoctoral Science Foundation (Grant No. 2015M5817100); and the special grade of the financial support from the China Postdoctoral Science Foundation (Grant No. 2016T100455).
- 24.Zhang FL, Feng SQ, Qiu KP, Liu ZJ, Fan YC, Zhang WH, Zhao Q, Zhou J (2015) Mechanically stretchable and tunable metamaterial absorber. Appl Phys Lett 106:01011007Google Scholar
- 25.Liu XM, Zhao Q, Lan CW, Zhou J (2013) Isotropic Mie resonance-based metamaterial perfect absorber. Appl Phys Lett 103:0311010Google Scholar
- 28.Fan YC, Zhang FL, Zhao Q, Wei ZY, Li HQ (2014) Tunable terahertz coherent perfect absorption in a monolayer grapheme. Opt Lett 310:62610Google Scholar
- 29.Fan YC, Liu Z, Zhang FL, Zhao Q, Wei ZY, Fu QH, Li2 JJ, Gu CZ, Li HQ (2015) Tunable mid-infrared coherent perfect absorption in a grapheme meta-surface. Sci Rep 5:131056Google Scholar
- 33.Bohren CF, and Huffman DR, Absorption and scattering of light by small particles, Wiley-Interscience, New York (11083)Google Scholar