Ultra-high sensitivity terahertz sensor based on a five-band absorber

Terahertz sensing is one of the most promising methods for label-free and noninvasive detection of refractive index changes. However, the figure of merit (FOM) of terahertz sensors in practical applications has been low. In this paper, a metamaterial sensor based on simple stacking of gold and silic...

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Bibliographic Details
Published in:Journal of optics (2010) 2022-05, Vol.24 (5), p.55102
Main Authors: Xiao, Wenfeng, Ou, Yanghong, Wang, Shiyu, Wang, Shuai, Meng, Yanzi, Zhai, Xiang, Xia, Shengxuan, Wang, Lingling
Format: Article
Language:English
Subjects:
Mie resonance
terahertz sensor
ultra-high sensitivity
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Summary:Terahertz sensing is one of the most promising methods for label-free and noninvasive detection of refractive index changes. However, the figure of merit (FOM) of terahertz sensors in practical applications has been low. In this paper, a metamaterial sensor based on simple stacking of gold and silicon dioxide is proposed, through whose structure not only narrow-band absorption with five absorption peaks is realized, but FOM is also improved to 1792. The excellent sensing performance and the mature manufacturing technology of this kind of structure provide a platform for the design of multi-band photodetectors and high-sensitivity sensors.
ISSN:2040-8978
2040-8986
DOI:10.1088/2040-8986/ac5b4f