Terahertz (THz) absorption spectroscopy is a powerful tool for molecular label-free fingerprinting, but it faces a formidable hurdle in enhancing the broadband spectral signals in trace-amount analysis. In this paper, we propose a sensing method based on the geometry scanning of metal metasurfaces with spoof surface polarization sharp resonances by numerical simulation. This scheme shows a significant absorption enhancement factor of about 200 times in an ultra-wide terahertz band to enable the explicit identification of various analytes, such as a trace-amount thin lactose film samples. The proposed method provides a new, to the best of our knowledge, choice for the enhancement of wide terahertz absorption spectra, and paves the way for the detection of trace-amount chemical, organic, or biomedical materials in the terahertz regime.
Terahertz (THz) absorption spectroscopy is widely used for molecular label-free fingerprinting detection, but it is not capable of efficiently analyzing trace-amount sample materials. For improving the efficiency of terahertz absorptance...
Since the frequency range accords with the ngerprint 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 elds in dielectric meta-grating 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 metals 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 that the absorption enhancement factor about 160 times for the 0.2µm lactose lm sample in the frequency range of 0.45-0.61 THz. This design will provide a better method for the detection of biomacromolecular materials.
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 meta-grating 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 metals 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 that the absorption enhancement factor about 160 times for the 0.2µm 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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