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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.01772 |
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| _version_ | 1866918485646376960 |
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| author | Guo, Junhui Dong, Bing Zhang, Eryong Tu, Qing-An He, Xiaoyong Wu, Xichuan Liu, Mingjing Gong, Maohua Meng, Yan Xi, Xiang Wang, Hongcheng Gao, Zhen |
| author_facet | Guo, Junhui Dong, Bing Zhang, Eryong Tu, Qing-An He, Xiaoyong Wu, Xichuan Liu, Mingjing Gong, Maohua Meng, Yan Xi, Xiang Wang, Hongcheng Gao, Zhen |
| contents | The terahertz (THz) spectral regime offers unique opportunities for next-generation biochemical sensing due to its non-destructive, label-free probing capability and strong sensitivity to molecular vibrations. However, conventional THz biosensors remain hampered by intrinsically low-quality factors and limited sensitivity, severely restricting their utility for trace-level biochemical and chemical detection. Here, we report an ultrasensitive THz metasurface biosensor that harnesses quasi-bound states in the continuum (QBICs) with sharp resonances and enhanced light-matter interactions to overcome these limitations. As a proof of concept, the device achieves label-free detection of a sulfur-containing amino acid cysteine, with an ultrahigh sensitivity of 492 GHz/RIU and an ultralow detection limit down to 0.00025 mg/mL. The synergy between QBIC-induced field confinement and meticulous structural optimization of the metasurface underpins this performance, marking a significant advance over conventional THz metasurface biosensing schemes. These results establish QBIC-based metasurfaces as a promising platform for ultrasensitive and high-precision biochemical and chemical sensing, with broad implications for medical diagnostics, food safety, and environmental monitoring. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_01772 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultrasensitive Terahertz Metasurface Biosensor Based on Quasi-Bound States in the Continuum Guo, Junhui Dong, Bing Zhang, Eryong Tu, Qing-An He, Xiaoyong Wu, Xichuan Liu, Mingjing Gong, Maohua Meng, Yan Xi, Xiang Wang, Hongcheng Gao, Zhen Optics The terahertz (THz) spectral regime offers unique opportunities for next-generation biochemical sensing due to its non-destructive, label-free probing capability and strong sensitivity to molecular vibrations. However, conventional THz biosensors remain hampered by intrinsically low-quality factors and limited sensitivity, severely restricting their utility for trace-level biochemical and chemical detection. Here, we report an ultrasensitive THz metasurface biosensor that harnesses quasi-bound states in the continuum (QBICs) with sharp resonances and enhanced light-matter interactions to overcome these limitations. As a proof of concept, the device achieves label-free detection of a sulfur-containing amino acid cysteine, with an ultrahigh sensitivity of 492 GHz/RIU and an ultralow detection limit down to 0.00025 mg/mL. The synergy between QBIC-induced field confinement and meticulous structural optimization of the metasurface underpins this performance, marking a significant advance over conventional THz metasurface biosensing schemes. These results establish QBIC-based metasurfaces as a promising platform for ultrasensitive and high-precision biochemical and chemical sensing, with broad implications for medical diagnostics, food safety, and environmental monitoring. |
| title | Ultrasensitive Terahertz Metasurface Biosensor Based on Quasi-Bound States in the Continuum |
| topic | Optics |
| url | https://arxiv.org/abs/2604.01772 |