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-wavelengt...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.展开更多
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)
文摘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.
