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Complex dielectric properties of anhydrous polycrystalline glucose in the terahertz region

机译：太赫兹区无水多晶葡萄糖的复介电特性

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摘要

We utilized terahertz time-domain spectroscopy to investigate the complex dielectric properties of solid polycrystalline material of anhydrous glucose. The imaginary part of the complex dielectric function of polycrystalline glucose showed that there were multiple characteristic absorption peaks from 0.2 to 2.2 THz. Moreover, for a given characteristic absorption peak, the real part of the complex dielectric function showed anomalous dispersion within the full width half maximum of the absorption peak. Both finite difference time-domain numerical simulations and experimental results showed that the complex dielectric function of glucose fits well with the Lorentz dielectric model. The plasma oscillation frequency was below the frequency of the light waves suggesting that the light waves passed through the polycrystalline glucose pellets. Calculations of multi-molecules of glucose based on density functional theory interpreted approximately that the characteristic absorption peaks of polycrystalline glucose originated mainly from collective intermolecular vibrations such as hydrogen bonds and crystal phonon modes.
机译：我们利用太赫兹时域光谱研究了无水葡萄糖固体多晶材料的复杂介电性能。多晶葡萄糖的复介电函数的虚部表明在0.2至2.2 THz处有多个特征吸收峰。而且，对于给定的特征吸收峰，复介电函数的实部在吸收峰的整个宽度半最大值内显示出异常色散。时域有限差分数值模拟和实验结果均表明，葡萄糖的复介电函数与洛仑兹介电模型非常吻合。等离子体振荡频率低于光波的频率，表明光波穿过多晶葡萄糖丸。基于密度泛函理论的葡萄糖多分子计算近似地解释为多晶葡萄糖的特征吸收峰主要来自集体分子间振动，例如氢键和晶体声子模式。

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