Graphene-integrated toroidal resonance metasurfaces used for picogram-level detection of chlorothalonil in the terahertz region

Toroidal dipole resonance can significantly reduce radiation loss of materials, potentially improving sensor sensitivity. Generally, toroidal dipole response is suppressed by electric and magnetic dipoles in natural materials, making it difficult to observe experimentally. However, as 2D metamateria...

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Published in:Optics express 2022-09, Vol.30 (19), p.34034-34042
Main Authors: Yang, Maosheng, Yao, Haiyun, Lu, Yuying, Li, Peipei, Du, Binbin, Ma, Qilin, Liu, Dandan, Zhang, Tan, Fang, Jie, Wang, Tongling, Yan, Xin, Zhang, Gang, Liang, Lanju, Yang, Qilin, Wang, Yaru, Wang, Meng, Dai, Zijie, Zhang, Jingjing, Ye, Yunxia, Song, Xiaoxian, Zhang, Haiting, Ren, Xundong, Yao, Jianquan
Format: Article
Language:English
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Summary:Toroidal dipole resonance can significantly reduce radiation loss of materials, potentially improving sensor sensitivity. Generally, toroidal dipole response is suppressed by electric and magnetic dipoles in natural materials, making it difficult to observe experimentally. However, as 2D metamaterials, metasurfaces can weaken the electric and magnetic dipole, enhancing toroidal dipole response. Here, we propose a new graphene-integrated toroidal resonance metasurface as an ultra-sensitive chemical sensor, capable of qualitative detection of chlorothalonil in the terahertz region, down to a detection limit of 100 pg/mL. Our results demonstrate graphene-integrated toroidal resonance metasurfaces as a promising basis for ultra-sensitive, qualitative detection in chemical and biological sensing.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.464346