Abstract-Design of ultrahigh refractive index metamaterials in the terahertz regime

• Xufeng Jing^1,  
• Rui Xia¹, 
• Xincui Gui¹, 
• Weimin Wang¹, 
• Ying Tian², 
• Dongshuo Zhu³, 
• Guohua Shi⁴

• ¹ Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China
• ² College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China
• ³ Institute of art and design, Renmin university of China
• ⁴ Jiangsu Key Laboratory of Medical Optics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China

http://www.sciencedirect.com/science/article/pii/S0749603617306237

A high refractive index metamaterial was theoretically designed in the terahertz region, and the proposed structure is to easy implementation. By decreasing the diamagnetic effect with a thin “I”-shaped metallic patch structure and drastically increasing the effective permittivity through strong capacitive coupling in the unit cell, the higher refractive index of designed metamaterial can be obtained while maintaining low losses in the resonant frequency. The physical mechanism of metamaterial possessing an enhanced refractive index is revealed by the surface current, the electric field and magnetic field distributions. Besides, the polarization characteristics and broad incident angles robustness for the high refractive index are demonstrated.