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.
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)
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)
