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.

Abstract-Manipulation of dual band ultrahigh index metamaterials in the terahertz region

Xufeng Jing, Weimin Wang, Rui Xia, Jingyin Zhao, Ying Tian, and Zhi Hong

https://www.osapublishing.org/ao/abstract.cfm?URI=ao-55-31-8743

By drastically decreasing the diamagnetic effect with a thin metallic structure in the unit cell and increasing the effective permittivity through strong capacitive coupling, we designed the crossed I-shaped metallic patches metamaterial with an extremely high refractive index in the dual band terahertz region. The peak index of refraction of near 80 at about 0.75 THz is predicted, along with another peak index of about 25 at 2.85 THz. Based on the careful analysis of the high index on the dependence of the electric field coupling effect, the magnetic field diamagnetic response, and the geometric parameters in the unit cell, it is found that both of the high index bands respectively correspond to different components in the metamaterial structure. To realize a higher effective refractive index for the second band as well as for the first one, we proposed the triple I-shaped metallic metamaterial structure.

© 2016 Optical Society of America

Full Article  |  PDF Article

Abstract-Manipulation of dual band ultrahigh index metamaterials in the terahertz region

Xufeng Jing, Weimin Wang, Rui Xia, Jingyin Zhao, Ying Tian, and Zhi Hong

https://www.osapublishing.org/ao/abstract.cfm?uri=ao-55-31-8743

By drastically decreasing the diamagnetic effect with a thin metallic structure in the unit cell and increasing the effective permittivity through strong capacitive coupling, we designed the crossed I-shaped metallic patches metamaterial with an extremely high refractive index in the dual band terahertz region. The peak index of refraction of near 80 at about 0.75 THz is predicted, along with another peak index of about 25 at 2.85 THz. Based on the careful analysis of the high index on the dependence of the electric field coupling effect, the magnetic field diamagnetic response, and the geometric parameters in the unit cell, it is found that both of the high index bands respectively correspond to different components in the metamaterial structure. To realize a higher effective refractive index for the second band as well as for the first one, we proposed the triple I-shaped metallic metamaterial structure.

© 2016 Optical Society of America

Full Article  |  PDF Article