【摘 要】
：
The terahertz (THz) resonance,chirality,and polarization conversion properties of a double-layer chiral metasurface have been experimentally investigated by THz
【机 构】
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Institute of Modern Optics, Nankai University, Tianjin 300350, China“,”Tianjin Key Laboratory of Opt
论文部分内容阅读
The terahertz (THz) resonance,chirality,and polarization conversion properties of a double-layer chiral metasurface have been experimentally investigated by THz time domain spectroscopy system and polarization detection method.The special symmetric geometry of each unit cell with its adjacent cells makes a strong chiral electromagnetic response in this metasurface,which leads to a strong polarization conversion effect.Moreover,compared with the traditional THz transmission resonance sensing for film thickness,the polarization sensing characterized by polarization elliptical angle (PEA) and polarization rotation angle (PRA) shows a better Q factor and figure of merit (FoM).The results show that the Q factors of the PEA and PRA reach 43.8 and 49.1 when the interval film is 20 μm,while the Q factor of THz resonance sensing is only 10.6.And these PEA and PRA can play a complementary role to obtain a double-parameter sensing method with a higher FoM,over 4 times than that of resonance sensing.This chiral metasurface and its polarization sensing method provide new ideas for the development of high-efficiency THz polarization manipulation,and open a window to the high sensitive sensing by using THz polarization spectroscopy.
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