Liquid crystal integrated metamaterial for multi-band terahertz linear polarization conversion  

作　　者：Shitong Xu Fei Fan Hongzhong Cao Yinghua Wang Shengjiang Chang 许士通;范飞;曹洪忠;王英华;常胜江(Shandong Provincial Key Laboratory of Laser Polarization and Information Technology,Department of Physics,School of Physics and Engineering,Qufu Normal University,Qufu 273165,China;Institute of Modern Optics,Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology,Nankai University,Tianjin 300350,China;Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology,Tianjin 300350,China)

机构地区：[1]Shandong Provincial Key Laboratory of Laser Polarization and Information Technology,Department of Physics,School of Physics and Engineering,Qufu Normal University,Qufu 273165,China [2]Institute of Modern Optics,Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology,Nankai University,Tianjin 300350,China [3]Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology,Tianjin 300350,China

出　　处：《Chinese Optics Letters》2021年第9期127-132,共6页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 62005143, 61831012, and 61971242);the Natural Science Foundation of Tianjin (No. 19JCYBJC16600);the Young Elite Scientists Sponsorship Program by Tianjin (No. TJSQNTJ-2017-12)

摘　　要：We experimentally investigate the linear polarization conversion for terahertz(THz)waves in liquid crystal(LC)integrated metamaterials,which consist of an LC layer sandwiched by two orthogonally arranged sub-wavelength metal gratings.A Fabry-Perot-like cavity is well constructed by the front and rear gratings,and it shows a strong local resonance mechanism,which greatly enhances the polarization conversion efficiency.Most importantly,the Fabry-Perot-like resonance can be actively tuned by modulating the refractive index of the middle LC layer under the external field.As a result,the integrated metamaterial achieves multi-band tunable linear polarization conversion.

关 键 词：TERAHERTZ liquid crystals METAMATERIAL polarization conversion 

分 类 号：TB34[一般工业技术—材料科学与工程]