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Design and analysis of multi-band zero-index superstructures based on double-sided metal microstructures

YABING FENG1, YING TIAN1, FENGYANG JIN1, PENGWEI ZHOU1,* , YI WEI1,2, YONGXING JIN1, JIANFENG WANG1, XIAOMEI ZHANG3, CHENXIA LI1, QIAOYI ZHOU4,*

Affiliation

  1. Institute of Optoelectronic Technology, China Jiliang University, Hangzhou, China
  2. Heroic Tech. Co.Ltd, Hangzhou, China
  3. Hangzhou Qiushi New Materials Technology Co., Ltd., Hangzhou 310018, China
  4. Zhejiang College of Construction, Hangzhou, 311231, Zhejiang, China

Abstract

The zero refractive index metamaterial discussed is a new type of material with a special electromagnetic property of equivalent refractive index of zero, which can provide a material platform for the application of terahertz, and is of great significance in the fields of wireless communication, imaging and security. A two-sided symmetric metal-cut line zero-index metamaterial structure is designed. The equivalent refractive index is zero near the resonant frequency of 0.74THz when terahertz wave is vertically incident on the metamaterial surface, and the zero refractive index characteristic of metamaterial is realized. We further designed a zero-index terahertz metamaterial structure with a cross metal block as the basic unit. When the terahertz wave is vertically incident on the surface of the metamaterial, it is observed that the electromagnetic characteristic of zero refractive index is obtained at the resonant frequency of 0.55THz when the electric field is TE polarization. In the case of TM polarization, zero refractive index electromagnetic properties are also obtained at the resonant frequency of 0.55THz. The metamaterial is polarization-insensitive near the resonant frequency of 0.55THz under optimized geometric parameters. Moreover, polarization-insensitive zero-index metamaterials have a wider application prospect in the terahertz field.

Keywords

Metamaterials, Terahertz, Zero-refractive index.

Citation

YABING FENG, YING TIAN, FENGYANG JIN, PENGWEI ZHOU, YI WEI, YONGXING JIN, JIANFENG WANG, XIAOMEI ZHANG, CHENXIA LI, QIAOYI ZHOU, Design and analysis of multi-band zero-index superstructures based on double-sided metal microstructures, Optoelectronics and Advanced Materials - Rapid Communications, 20, 7-8, July-August 2026, pp.293-304 (2026).

Submitted at: March 2, 2026

Accepted at: Aug. 3, 2026