Abstract
Since the frequency range accords with the fingerprint characteristics of many biomacromolecular materials, terahertz (THz) waves are widely used in the detection of biomacromolecular materials. However, when it is used for real application, how to measure the spectral of trace amount analysis samples is a major challenge. By localizing electromagnetic fields in dielectric metagrating or metasurfaces is the most popular way to enhance the spectral signal. In this paper, we propose a design of THz structure that excites a series of spoof surface plasmon (SSP) sharp resonances on the geometry multiplexing metal metasurfaces in one layer to enhance the terahertz absorption spectrum of biomacromolecular materials. The structure can be manufactured and measured easily. The enhanced absorption spectrum can be built by linking a series of SSP sharp resonances. Numerical results show the absorption enhancement factor about 160 times for the 0.2-µm lactose film sample in the frequency range of 0.45–0.61 THz. This design will provide a better method for the detection of biomacromolecular materials.
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The data generated and/or analyzed during the current study are not publicly available for legal/ethical reasons but are available from the corresponding author on reasonable request.
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Funding
This research was funded by National Key R&D Program of China (2021YFF0600300); National Natural Science Foundation of China (62175223); Fundamental Research Funds for the Provincial Universities of Zhejiang (2021YW13); and Basic Public Welfare Research Project of Zhejiang Province (No. LTGN23C180003).
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X. J. Li and D. X. Yan wrote the main manuscript text. J. Yang, Y. Zhao, and H. D. Liu simulated the numerical simulations. L. Zhang polished the paper. All authors reviewed the manuscript.
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Yang, J., Li, X., Yan, D. et al. Enhanced Trace Amount Terahertz Fingerprint Spectroscopy Using Symmetrical Spoof Surface Plasmon Metasurfaces. Plasmonics 18, 1083–1091 (2023). https://doi.org/10.1007/s11468-023-01834-9
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DOI: https://doi.org/10.1007/s11468-023-01834-9