Enhanced Trace Amount Terahertz Fingerprint Spectroscopy Using Symmetrical Spoof Surface Plasmon Metasurfaces

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 sampl...

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Bibliographic Details
Published in:Plasmonics (Norwell, Mass.) Mass.), 2023-06, Vol.18 (3), p.1083-1091
Main Authors: Yang, Ji, Li, Xiangjun, Yan, Dexian, Zhang, Le, Zhao, Yang, Liu, Huadong
Format: Article
Language:English
Subjects:
Absorption spectra
Biochemistry
Biological and Medical Physics
Biophysics
Biotechnology
Chemistry
Chemistry and Materials Science
Electromagnetic fields
Fingerprints
Frequency ranges
Lactose
Metasurfaces
Multiplexing
Nanotechnology
Plasmons
Spectrum analysis
Surface chemistry
Terahertz frequencies
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Summary: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.
ISSN:1557-1955
1557-1963
DOI:10.1007/s11468-023-01834-9