Ultrathin dual-band polarization angle independent 90 degrees polarization rotator with giant optical activity based on planar chiral metamaterial

作者：Zhao, Jingcheng; Cheng, Yongzhi^*

来源：Applied Physics B: Lasers and Optics , 2018, 124(9): 185.

DOI：10.1007/s00340-018-7050-6

• NEGATIVE REFRACTIVE-INDEX
• CIRCULAR-DICHROISM
• ASYMMETRIC TRANSMISSION
• CONVERSION

An ultrathin dual-band planar chiral metamaterial (CMM) with giant optical activity using Fermat's Spiral structure (FSs) was proposed, which could yield a near polarization angle independent 90 degrees rotation characteristic. The proposed CMM can convert an incident linear polarization (y-/x-polarized) wave into its cross-polarization (x-/y-polarized) or experience a near 90 degrees polarization rotation at 4.67 and 8.51GHz, respectively. The experiment results are in agreement well with numerical simulation. The surface current distributions of unit-cell structure of the proposed CMM were analyzed to illustrate the physics mechanism of this giant optical activity with 90 degrees polarization rotation. Good performances and compact design of the CMM suggest a promising application in 90 degrees polarization rotator that need to be integrated with other compact devices.

• 出版日期2018-9
• 单位武汉科技大学; 北京航空航天大学