title: Broadband terahertz metamaterial absorber based on sectional asymmetric structures.
abstract: We suggest and demonstrate the concept and design of sectional asymmetric structures which can manipulate the metamaterial absorber's working bandwidth with maintaining the other inherent advantages. As an example, a broadband terahertz perfect absorber is designed to confirm its effectiveness. The absorber's each cell integrates four sectional asymmetric rings, and the entire structure composed of Au and Si3N4 is only 1.9 μm thick. The simulation results show the bandwidth with absorptivity being larger than 90% is extended by about 2.8 times comparing with the conventional square ring absorber. The composable small cell, ultra-thin, and broadband absorption with polarization and incident angle insensitivity will make the absorber suitable for the applications of focal plane array terahertz imaging.
authors: Institute of Modern Optics, Nankai University, Key Laboratory of Optical Information Science and Technology, Ministry of Education, Tianjin 300071, China.
authors: Cheng
authors: C
authors: Gong
authors: School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China.
authors: Mingzhou
authors: M
authors: Zhan
authors: Institute of Modern Optics, Nankai University, Key Laboratory of Optical Information Science and Technology, Ministry of Education, Tianjin 300071, China.
authors: Jing
authors: J
authors: Yang
authors: School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China.
authors: Zhigang
authors: Z
authors: Wang
authors: Institute of Modern Optics, Nankai University, Key Laboratory of Optical Information Science and Technology, Ministry of Education, Tianjin 300071, China.
authors: Haitao
authors: H
authors: Liu
authors: School of Optoelectronics, Beijing Institute of Technology, Beijing, 100081, China.
authors: Yuejin
authors: Y
authors: Zhao
authors: Institute of Modern Optics, Nankai University, Key Laboratory of Optical Information Science and Technology, Ministry of Education, Tianjin 300071, China.
authors: Weiwei
authors: W
authors: Liu