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Volume 15
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10.3390/nano15040284
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Article

Plasmonic-Enhanced Infrared Absorption Platform for Broadband and Multiple Molecular Fingerprint Retrieval

by
Yulong Hu
1,2,†,
Zexing Zheng
1,†,
Huishan Ma
1,
Shuguang Zhu
1,
Yiming Yu
1,
Jie Hong
1,
Weiwei Tang
1,*,
Jiale He
1,
Libo Zhang
1,
Changlong Liu
1,
Guanhai Li
1,2 and
Xiaoshuang Chen
1,2,*
1
College of Physics and Optoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
2
State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Nanomaterials 2025, 15(4), 284; https://doi.org/10.3390/nano15040284
Submission received: 13 January 2025 / Revised: 8 February 2025 / Accepted: 11 February 2025 / Published: 13 February 2025
(This article belongs to the Special Issue Microstructure Semiconductor Materials and Optoelectronic Applications)
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Abstract

The mid-infrared (mid-IR) region, often referred to as the molecular fingerprint region, encompasses the distinctive absorption spectra characteristic of numerous important molecules. However, the intrinsically small molecular absorption cross-sections, combined with the size mismatch between nanoscale molecules and microscale mid-IR wavelengths, result in inherently weak light-molecule interactions. In this work, we propose a broadband, tunable platform based on plasmonic-enhanced infrared absorption for label-free retrieval of molecular fingerprints. By leveraging the strong near-field enhancement of the plasmonic structure, the platform significantly amplifies light-molecule interactions, enabling precise reconstruction of the fingerprint absorption spectra of target molecules. In addition, the proposed structure exhibits exceptional molecular detection capabilities across the wavelength range of 5–10 μm, with remarkable potential for distinguishing molecular mixture components. The results pave the way for the applications in chemical identification, biomedical diagnostics, environmental monitoring, and other interdisciplinary fields, which require miniaturized and high-precision sensing.
Keywords: mid-infrared; molecular fingerprint; tunable plasmonic metasurface; surface-enhanced infrared absorption mid-infrared; molecular fingerprint; tunable plasmonic metasurface; surface-enhanced infrared absorption

Share and Cite

MDPI and ACS Style

Hu, Y.; Zheng, Z.; Ma, H.; Zhu, S.; Yu, Y.; Hong, J.; Tang, W.; He, J.; Zhang, L.; Liu, C.; et al. Plasmonic-Enhanced Infrared Absorption Platform for Broadband and Multiple Molecular Fingerprint Retrieval. Nanomaterials 2025, 15, 284. https://doi.org/10.3390/nano15040284

AMA Style

Hu Y, Zheng Z, Ma H, Zhu S, Yu Y, Hong J, Tang W, He J, Zhang L, Liu C, et al. Plasmonic-Enhanced Infrared Absorption Platform for Broadband and Multiple Molecular Fingerprint Retrieval. Nanomaterials. 2025; 15(4):284. https://doi.org/10.3390/nano15040284

Chicago/Turabian Style

Hu, Yulong, Zexing Zheng, Huishan Ma, Shuguang Zhu, Yiming Yu, Jie Hong, Weiwei Tang, Jiale He, Libo Zhang, Changlong Liu, and et al. 2025. "Plasmonic-Enhanced Infrared Absorption Platform for Broadband and Multiple Molecular Fingerprint Retrieval" Nanomaterials 15, no. 4: 284. https://doi.org/10.3390/nano15040284

APA Style

Hu, Y., Zheng, Z., Ma, H., Zhu, S., Yu, Y., Hong, J., Tang, W., He, J., Zhang, L., Liu, C., Li, G., & Chen, X. (2025). Plasmonic-Enhanced Infrared Absorption Platform for Broadband and Multiple Molecular Fingerprint Retrieval. Nanomaterials, 15(4), 284. https://doi.org/10.3390/nano15040284

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