Guo-zhong Zhao

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Identification is very important for the development of Chinese traditional medicines. In recent years, rapid progress in ultrafast laser technology provides a steady and available source for,terahertz pulses generation, which greatly promotes the development of THz spectroscopy and imaging technique. SVM is a method for recognition of two kinds of samples.(More)
THz time domain spectrum of KH2PO4 crystal in the range from 0.2 to 1.6 THz, the far-infrared spectrum in the range from 50-4000 cm(-1), and ultraviolet-visible-infrared spectrum in the range from 200-2000 nm were measured at the room temperature. The energy band gap Eg of KH2PO4 Crystal is 5.91 eV. There is a wide band of the phonon absorption in the KDP(More)
As an important inter-unit of lignin, guaiacylglycerol-β-guaiacyl (GG) ether has been synthesized, and characterized using terahertz time-domain spectroscopy in the frequency range of 5-85 cm(-1). Seven absorption peaks have been observed. Among these peaks, the 49.8 cm(-1) and 57.6 cm(-1) vibrations are propose to be characteristic absorption peaks of GG(More)
Intermolecular hydrogen bond vibrations may be observed in the THz range. Carbohydrates are important bio-molecules, and are the typical systems for the study of hydrogen bonds. Carbohydrate derivatives have critical biological functions, and there are extensive hydrogen bond networks in molecular system, therefore, they would have various bands in the THz(More)
The terahertz (THz) spectra of nicotinic acid, nicotinamide and nicotine were studied at room temperature. The time-domain THz spectra were measured. The frequency-domain spectra were obtained by fast Fourier transform (FFT). The spectral response and the dispersive relationship of refractive index in THz spectral range were obtained. The results show that(More)
In the present paper, the authors report the characterization of multiwalled carbon nanotube at terahertz (THz) frequency range using terahertz time-domain spectroscopy. The surface appearances and microanalysis of multiwalled carbon nanotubes were measured by scanning electron microscope in order to fully understand the unique features and applications of(More)
In the present paper, THz spectra of xylitol and D-xylose are measured at room temperature in the frequency region of 0.3-2.6 THz. The results show that characteristic absorption peak of D-xylose was found at 1.67, 1.96 and 2.46 THz, and those of xylitol at 1.62, 1.87 and 2.51 THz. At the same time, density functional theory was applied to obtain the(More)
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