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Chin. Opt. Lett.
 Home  List of Issues    Issue s1 , Vol. 09 , 2011    10.3788/COL201109.s10507

Terahertz spectroscopy studies of far-infrared optical and dielectric signatures of melamine
Mingxia He1;2, Jiaguang Han1, Meng Li1, Zhen Tian1;2, Yanjun Yu3, Weili Zhang2
1 College of Precision Instrument and Optoelectronics Engineering and Centre for Terahertz Waves, [Tianjin University], Tianjin 300072, China
2 School of Electrical and Computer Engineering, [Oklahoma State University], Stillwater, Oklahoma 74078, USA
3 [Tianjin Entry-Exit Inspection and Quarantine Bureau], Tianjin 300042, China

Chin. Opt. Lett., 2011, 09(s1): pp.s10507

Topic:Terahertz Spectroscopy and Imaging
Keywords(OCIS Code): 300.6495  300.6270  000.1430  

We report on the far–infrared optical properties of melamine characterized by terahertz time–domain spectroscopy (THz–TDS). Transmission measurement reveals three low–frequency vibration modes at 1.99, 2.25, and 2.61 THz, which may provide fingerprints for direct melamine detection. By combining THz–TDS with Fourier transform infrared (FTIR) spectroscopy, an overall low–frequency optical response of melamine is presented in an extended spectral range of 0.2–6.2 THz. In this range, the low-frequency vibration mode at 3.96 THz is recorded via FTIR. The measured THz spectra are well fit by the multiple–oscillator model, thereby demonstrating that the low–frequency THz response of melamine is a consequence of the lowest four vibration modes.

Copyright: © 2003-2012 . This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Posted online:2011/6/29

Get Citation: Mingxia He, Jiaguang Han, Meng Li, Zhen Tian, Yanjun Yu, Weili Zhang, "Terahertz spectroscopy studies of far-infrared optical and dielectric signatures of melamine," Chin. Opt. Lett. 09(s1), s10507(2011)

Note: This work was partly supported by the Tianjin Science & Technology Commission of China (Nos. 09ZCKFGX01500 and 10JCYBJC01400), the National Natural Science Foundation of China (No. 60977064), and the National "111" Project of China (No. B07014).


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