Received: Nov. 12, 2018
Accepted: Jan. 25, 2019
Posted: Apr. 15, 2019
Published Online: Apr. 15, 2019
The Author Email: Lan Wang (email@example.com), Yaxin Zhang (firstname.lastname@example.org)
Han Sun1, Lan Wang1,*, Yaxin Zhang1,**, Shixiong Liang2, Jiaguang Han3, Feng Lan1, Xinlan Zhou1, and Ziqiang Yang1
This Letter presents a double-layer structure combining a cracked cross meta-surface and grating surface to realize arbitrary incident linear terahertz (THz) wave polarization conversion. The arbitrary incident linear polarization THz wave will be induced with the same resonant modes in the unit cell, which results in polarization conversion insensitive to the linear polarization angle. Moreover, the zigzag-shaped resonant surface current leads to a strong magnetic resonance between the meta-surface and gratings, which enhances the conversion efficiency. The experimental results show that a more than 70% conversion rate can be achieved under arbitrary linear polarization within a wide frequency band. Moreover, around 0.89 THz nearly perfect polarization conversion is realized.