Quasi-Bound States in the Continuum-Enabled Wideband Terahertz Molecular Fingerprint Sensing Using Graphene Metasurfaces
The unique molecular fingerprint spectral characteristics in the terahertz (THz) band provide distinct advantages for non-destructive and rapid biomolecular detection. However, conventional THz metasurface biosensors still face significant challenges in achieving highly sensitive and precise detecti...
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MDPI AG
2025-07-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/15/15/1178 |
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| author | Jing Zhao Jiaxian Wang |
| author_facet | Jing Zhao Jiaxian Wang |
| author_sort | Jing Zhao |
| collection | DOAJ |
| description | The unique molecular fingerprint spectral characteristics in the terahertz (THz) band provide distinct advantages for non-destructive and rapid biomolecular detection. However, conventional THz metasurface biosensors still face significant challenges in achieving highly sensitive and precise detection. This study proposes a sensing platform based on quasi-bound states in the continuum (Quasi-BIC), which enhances molecular fingerprint recognition through resonance amplification. We designed a symmetric graphene double-split square ring metasurface structure. By modulating the Fermi level of graphene, this system generated continuously tunable Quasi-BIC resonance peaks across a broad THz spectral range, achieving precise spectral overlap with the characteristic absorption lines of lactose (1.19 THz and 1.37 THz) and tyrosine (0.958 THz). The results demonstrated a remarkable 763-fold enhancement in absorption peak intensity through envelope analysis for analytes with 0.1 μm thickness, compared to conventional bare substrate detection. This terahertz BIC metasurface sensor demonstrates high detection sensitivity, holding significant application value in fields such as biomedical diagnosis, food safety, and pharmaceutical testing. |
| format | Article |
| id | doaj-art-d76d31e39c3740e29f2bc29af7a03d29 |
| institution | DOAJ |
| issn | 2079-4991 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
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| series | Nanomaterials |
| spelling | doaj-art-d76d31e39c3740e29f2bc29af7a03d292025-08-20T03:02:56ZengMDPI AGNanomaterials2079-49912025-07-011515117810.3390/nano15151178Quasi-Bound States in the Continuum-Enabled Wideband Terahertz Molecular Fingerprint Sensing Using Graphene MetasurfacesJing Zhao0Jiaxian Wang1The Higher Educational Key Laboratory for Flexible Manufacturing Equipment Integration of Fujian Province, Xiamen Institute of Technology, Xiamen 361021, ChinaSchool of Artificial Intelligence, Xiamen Institute of Technology, Xiamen 361021, ChinaThe unique molecular fingerprint spectral characteristics in the terahertz (THz) band provide distinct advantages for non-destructive and rapid biomolecular detection. However, conventional THz metasurface biosensors still face significant challenges in achieving highly sensitive and precise detection. This study proposes a sensing platform based on quasi-bound states in the continuum (Quasi-BIC), which enhances molecular fingerprint recognition through resonance amplification. We designed a symmetric graphene double-split square ring metasurface structure. By modulating the Fermi level of graphene, this system generated continuously tunable Quasi-BIC resonance peaks across a broad THz spectral range, achieving precise spectral overlap with the characteristic absorption lines of lactose (1.19 THz and 1.37 THz) and tyrosine (0.958 THz). The results demonstrated a remarkable 763-fold enhancement in absorption peak intensity through envelope analysis for analytes with 0.1 μm thickness, compared to conventional bare substrate detection. This terahertz BIC metasurface sensor demonstrates high detection sensitivity, holding significant application value in fields such as biomedical diagnosis, food safety, and pharmaceutical testing.https://www.mdpi.com/2079-4991/15/15/1178terahertz sensinggraphene metasurfacequasi-bound states in the continuummolecular fingerprint recognition |
| spellingShingle | Jing Zhao Jiaxian Wang Quasi-Bound States in the Continuum-Enabled Wideband Terahertz Molecular Fingerprint Sensing Using Graphene Metasurfaces Nanomaterials terahertz sensing graphene metasurface quasi-bound states in the continuum molecular fingerprint recognition |
| title | Quasi-Bound States in the Continuum-Enabled Wideband Terahertz Molecular Fingerprint Sensing Using Graphene Metasurfaces |
| title_full | Quasi-Bound States in the Continuum-Enabled Wideband Terahertz Molecular Fingerprint Sensing Using Graphene Metasurfaces |
| title_fullStr | Quasi-Bound States in the Continuum-Enabled Wideband Terahertz Molecular Fingerprint Sensing Using Graphene Metasurfaces |
| title_full_unstemmed | Quasi-Bound States in the Continuum-Enabled Wideband Terahertz Molecular Fingerprint Sensing Using Graphene Metasurfaces |
| title_short | Quasi-Bound States in the Continuum-Enabled Wideband Terahertz Molecular Fingerprint Sensing Using Graphene Metasurfaces |
| title_sort | quasi bound states in the continuum enabled wideband terahertz molecular fingerprint sensing using graphene metasurfaces |
| topic | terahertz sensing graphene metasurface quasi-bound states in the continuum molecular fingerprint recognition |
| url | https://www.mdpi.com/2079-4991/15/15/1178 |
| work_keys_str_mv | AT jingzhao quasiboundstatesinthecontinuumenabledwidebandterahertzmolecularfingerprintsensingusinggraphenemetasurfaces AT jiaxianwang quasiboundstatesinthecontinuumenabledwidebandterahertzmolecularfingerprintsensingusinggraphenemetasurfaces |