AUTHOR=Ma Anchen , Zhong Renbin , Wu Zhenhua , Wang Yiqing , Yang Long , Liang Zekun , Fang Zheng , Liu Shenggang 

TITLE=Ultrasensitive THz Sensor Based on Centrosymmetric F-Shaped Metamaterial Resonators

JOURNAL=Frontiers in Physics

VOLUME=Volume 8 - 2020

YEAR=2020

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2020.584639

DOI=10.3389/fphy.2020.584639

ISSN=2296-424X

ABSTRACT=An ultra-sensitive metamaterial terahertz absorption sensor based on centrosymmetric double F-shaped metal resonators is proposed in this study. The sensor achieved a perfect narrow-band absorption spectrum at 5.92 THz with high quality factor of 49.6, it showed ultra-sensitive performance on the variation of refractive index and thickness of the surface analyte with sensitivity of 1800 GHz/RIU and figure of merit value of 15. Additionally, for a typical biomedical analyte of n = 1.3, the sensitivity was 134 GHz/µm. The excellent properties promise its significant practical applications in ultra-sensitive THz biomedical sensors and detectors.