中国激光, 2011, 38 (s1): s111008, 网络出版: 2011-11-09
氨基酸的超宽带太赫兹光谱
Terahertz Broadband Spectroscopic Investigations of Amino Acid
摘要
利用空气电离相干探测系统通过实验测量了氨基酸的太赫兹光谱。通过双色激光脉冲诱导空气等离子体可以产生较强的超带宽(0.1~10 THz)太赫兹信号并通过外差式相干探测进行探测。通过实验测量了赖氨酸(C6H14N2O2)和精氨酸(C6H14N4O2)的太赫兹反射式宽带谱。为了解决反射式太赫兹时域光谱技术在相位匹配上的问题，采用相对反射率对频率的一阶导数提取材料的吸收参数。由于大于6 THz频率样品对信号的吸收较大，因此将频率窗口定在0.5~6 THz下，实验中可以发现两种氨基酸均在1.10 THz处有吸收峰。
Abstract
We present an experimental terahertz (THz) spectroscopic investigation of amino acid using an air-breakdown-coherent detection (ABCD) system. The strong and ultra-broadband (0.1~10 THz) terahertz radiations generated by two-color laser induced air plasma and measured by coherent heterodyne detection. The broadband THz reflection spectra of L-lysine (C6H14N2O2) and L-arginine (C6H14N4O2) are obtained. To solve the phase-retrieval problem in reflective THz time-domain spectroscopy (TDS), the absorption signatures of the materials are extracted directly from the first derivative of the relative reflectance with respect to frequency. The absorption features of the two amino acids are characterized in the 0.5~6 THz region. It is found that both the two amino acids have an absorption peak at 1.10 THz.
祝德充, 张亮亮, 赵亚芹, 张馨, 王晓燕, 张存林. 氨基酸的超宽带太赫兹光谱[J]. 中国激光, 2011, 38(s1): s111008. Zhu Dechong, Zhang Liangliang, ZhaoYaqin, Zhang Xin, Wang Xiaoyan, Zhang Cunlin. Terahertz Broadband Spectroscopic Investigations of Amino Acid[J]. Chinese Journal of Lasers, 2011, 38(s1): s111008.
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