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- Title
Enhancing Multi-Spectral Fingerprint Sensing for Trace Explosive Molecules with All-Silicon Metasurfaces.
- Authors
Lin, Jie; Xue, Ying; Wang, Weijin; Sun, Mingjun; Shi, Shengnan; Zhang, Shan; Shi, Yanpeng
- Abstract
Spectroscopy is a powerful tool to identify the specific fingerprints of analytes in a label-free way. However, conventional sensing methods face unavoidable barriers in analyzing trace-amount target molecules due to the difficulties of enhancing the broadband molecular absorption. Here, we propose a sensing scheme to achieve strong fingerprint absorption based on the angular-scanning strategy on an all-silicon metasurface. By integrating the mid-infrared and terahertz sensing units into a single metasurface, the sensor can efficiently identify 2,4-DNT with high sensitivity. The results reveal that the fingerprint peak in the enhanced fingerprint spectrum is formed by the linked envelope. It exhibits a significant enhancement factor exceeding 64-fold in the terahertz region and more than 55-fold in the mid-infrared region. Particularly, the corresponding identification limit of 2,4-DNT is 1.32 µg cm−2, respectively. Our study will provide a novel research idea in identifying trace-amount explosives and advance practical applications of absorption spectroscopy enhancement identification in civil and military security industries.
- Subjects
MULTISPECTRAL imaging; TERAHERTZ spectroscopy; MOLECULES; SENSES
- Publication
Nanomaterials (2079-4991), 2024, Vol 14, Issue 9, p738
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano14090738