Year: 2014
Type: preprint
Abstract: We demonstrated an ultra-broadband, polarization-insensitive and wide-angle metamaterial absorber for terahertz (THz) frequencies using arrays of truncated pyramid unit structure made of metal-dielectric multilayer composite. In our design each sub-layer behaving as an effective waveguide is gradually modified in their lateral width to realize a wideband response by effectively stitching together the resonance bands of different waveguide modes. Experimentally, our five layer sample with a total thickness 21um is capable of producing a large absorptivity above 80% from 0.7 to 2.3 THz up to the maximum measurement angle 40°. The full absorption width at half maximum (FWHM) of our device is around 127%, greater than those previously reported for THz frequencies. Our absorber design has high practical feasibility and can be easily integrated with the semiconductor technology to make high efficient THz-oriented devices.
Source: arXiv (Cornell University)
Authors: Zhu, Jianfei, Ma, Zhaofeng, Sun, Wujiong, Ding, Fei, He, Qiong, Zhou, Lei, Ma, Yungui
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Funders: Ministry of Education, India, Program of Shanghai Subject Chief Scientist, Program for New Century Excellent Talents in University, National High-tech Research and Development Program, Fundamental Research Funds for the Central Universities, Specialized Research Fund for the Doctoral Program of Higher Education of China
Awards: G6353817221, G6566186338
OpenAlex ID: W171803960