ABSTRACT
We report a polarization-independent unnaturally high refractive index metamaterial. It is found that the effective permittivity of the designed metamaterial can be drastically increased by the capacitive coupling effect. Also, the effective permeability of metamaterial can be increased by reducing the diamagnetic effect by designing a thin structure. In our work, the single-layer multi-band high refractive index metamaterials with a peak achieving to 26.8 at 0.9 THz is demonstrated. Furthermore, the three-dimensional metamaterial possessing high refractive index more than 85 around 0.91 THz can be constructed by a double-layer tricyclic structure. Ultrabroadband and ultrahigh refractive index of designed metamaterials can be obtained by multilayer coupling effect. In addition, the polarization-independent property and wide-angle performance of high refractive index metamaterial are exhibited.
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Notes on contributors
Bo Fang
Bo Fang is associate professor of China Metrology University, master’s tutor, graduated from the Department of Applied Physics, Southwest Jiaotong University, and his PhD degree from School of Optoelectronic Information and Computer Engineering, University of Shanghai for Science and Technology.
Zhiyu Cai
Zhiyu Cai is a graduate student of China Metrology University.
Yandong Peng
Peng Yandong, male, associate professor, Shandong Tai’an, master’s tutor. In June 2011, he received his PhD in Optics from the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences. Since July 2011, he has worked in the School of Science and Electronic Communication and Physics of Shandong University of Science and Technology.
Chenxia Li
Chenxia Li is an associate professor at China Metrology University and graduated from Shanghai University of Technology in 2009.
Zhi Hong
Zhi Hong received his bachelor’s and master’s degrees in electrical engineering from Zhejiang University in 1984 and 1987, and his PhD in optical engineering from Zhejiang University in 2001. 1987.7–2005.12 State Key Laboratory of Modern Optical Instruments, Zhejiang University (2001 Researcher, 2002 Optical Engineering Doctoral Supervisor). 2006.1–Researcher, School of Mechanical and Electrical Engineering, China Institute of Metrology, Director of Institute of Technology and Applications, China Institute of Metrology. In 1999 and 2000, he went to the Berlin University of Technology in cooperation research, and visited professors from Alberta University, Canada, from 2003 to 2003.12. 2007.8–2007.11 Visiting Professor of the Terahertz Research Center, Rensselaer Institute of Technology, USA.
Xufeng Jing
Xufeng Jing is associate professor of China Metrology University, master’s tutor. He got his PhD in Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences in 2011.