Chinese Optics Letters, 2019, 17 (4): 041602, Published Online: Apr. 15, 2019  

Arbitrary linear THz wave polarization converter with cracked cross meta-surface Download: 705次

Author Affiliations
1 Terahertz Science and Technology Research Center, University of Electronic Science and Technology of China, Chengdu 610054, China
2 National Key Laboratory of Application Specific Integrated Circuit, Hebei Semiconductor Research Institute, Shijiazhuang 050051, China
3 Center for Terahertz Waves, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronic Information Technology, Ministry of Education, Tianjin 300072, China
Abstract
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.

Han Sun, Lan Wang, Yaxin Zhang, Shixiong Liang, Jiaguang Han, Feng Lan, Xinlan Zhou, Ziqiang Yang. Arbitrary linear THz wave polarization converter with cracked cross meta-surface[J]. Chinese Optics Letters, 2019, 17(4): 041602.

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