Journal
CHINESE PHYSICS B
Volume 29, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/ab9294
Keywords
terahertz; chiral metasurface; polarization conversion; sensing
Categories
Funding
- National Key Research and Development Program of China [2017YFA0701000]
- National Natural Science Foundation of China [61971242, 61831012, 61671491]
- Natural Science Foundation of Tianjin City, China [19JCYBJC16600]
- Young Elite Scientists Sponsorship Program by Tianjin, China [TJSQNTJ-2017-12]
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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 betterQfactor and figure of merit (FoM). The results show that theQfactors of the PEA and PRA reach 43.8 and 49.1 when the interval film is 20 mu m, while theQfactor 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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