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Based on dispersion engineering of the electric dipoles, we design a tunable reflection-type phase modulator(PM) with constant group delay time(GDT). The PM is demonstrated a high coupling efficiency and good linear phase reflective response in 8.4–11.4GHz. The time-domain response is also analyzed, which presents a coherent result with frequency responses. The PM can be used to design achromatic...
In this work, a typical two-dimensional (2D) material WS2 on a dielectric substrate is measured by terahertz time-domain spectroscopy (THz-TDS) and analyzed using the Drude conductivity model. The transmittance and sheet conductivity of monolayer WS2 have been obtained. This technology can be used to measure the thin film 2D materials in THz frequency regions.
In this work, terahertz time-domain spectroscopy was employed to establish the fingerprints of Radix Angelicae Dahuricae (RAD). Principal component analysis (PCA) and k-subspace clustering were employed to study the similarities and dissimilarities among the 120 RAD samples. The methods can be successfully used to classify these samples according to their regions. The results show that the referred...
The terahertz absorption spectra of BSA (Bovine Serum Albumin) in aqueous solution were measured under different pH values from 2.2 to 8. The absorption spectra were analyzed using the two-dimensional correlation spectroscopy (2DCOS). By comparing the cross peaks corresponding to the different pH values, it can be obtained that the conformation is related to the pH condition.
In this work, 120 herbal medicine samples of Radix Angelicae Dahuricae (Baizhi) before and after the sulfur fumigation process were measured by terahertz time-domain spectroscopy and analyzed by support vector machine technology. The results show that the advanced algorithm used in this paper can get a classification accuracy rate of 100%. This technology can be used to qualitatively identify the...
In this work, a typical two-dimensional (2D) material MoS2 on a dielectric substrate is measured by terahertz time-domain spectroscopy (THz-TDS) and analyzed using the Drude model. The transmittance and sheet conductivity of monolayer MoS2 have been obtained. This technology can be used to measure the thin film 2D materials in THz frequency regions.
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