Broadband mid-infrared perfect absorber using fractal Gosper curve
physics.optics
/ Authors
Jihua Zou, Peng Yu, Wenhao Wang, Xin Tong, Le Chang, Cuo Wu, Wen Du, Haining Ji, Yongjun Huang, Xiaobin Niu
and 3 more authors
/ Abstract
Designing broadband metamaterial perfect absorbers is challenging due to the intrinsically narrow bandwidth of surface plasmon resonances. Here, the paper reports an ultra-broadband metamaterial absorber by using space filling Gosper curve. The optimized result shows an average absorptivity of 95.78% from 2.64 to 9.79 μm across the entire mid-infrared region. Meanwhile, the absorber shows insensitivity to the polarization angle and the incident angle of the incident light. The underlying physical principles, used in our broadband absorber, involve a fractal geometry with multiple scales and a dissipative plasmonic crystal. The broadband perfect absorption can be attributed to multiple electric resonances at different wavelengths supported by a few segments in the defined Gosper curve.