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Chin. Phys. B, 2020, Vol. 29(7): 078705    DOI: 10.1088/1674-1056/ab9296
Special Issue: SPECIAL TOPIC —Terahertz physics
SPECIAL TOPIC—Terahertz physics Prev   Next  

Broadband terahertz time-domain spectroscopy and fast FMCW imaging: Principle and applications

Yao-Chun Shen(沈耀春), Xing-Yu Yang(杨星宇), Zi-Jian Zhang(张子健)
Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, UK
Abstract  We report a broadband terahertz time-domain spectroscopy (THz-TDS) which enables twenty vibrational modes of adenosine nucleoside to be resolved in a wide frequency range of 1-20 THz. The observed spectroscopic features of adenosine are in good agreement with the published spectra obtained using Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. This much extended bandwidth leads to enhanced material characterization capability as it provides spectroscopic information on both intra- and inter-molecular vibrations. In addition, we also report a low-cost frequency modulation continuous wave (FMCW) imaging system which has a fast measurement speed of 40000 waveforms per second. Cross-sectional imaging capability through cardboard has also been demonstrated using its excellent penetration capability at a frequency range of 76-81 GHz. We anticipate that the integration of these two complementary imaging technologies would be highly desirable for many real-world applications because it provides both spectroscopic discrimination and penetration capabilities in a single instrument.
Keywords:  terahertz time-domain spectroscopy (THz-TDS)      FMCW radar      adenosine nucleoside  
Received:  01 April 2020      Revised:  04 May 2020      Published:  05 July 2020
PACS:  87.14.gf (Nucleotides)  
  82.80.Gk (Analytical methods involving vibrational spectroscopy)  
  78.47.J- (Ultrafast spectroscopy (<1 psec))  
  84.40.-x (Radiowave and microwave (including millimeter wave) technology)  
Fund: Project supported by the Royal Society and Natural Science Foundation of China (NSFC) International Exchanges Cost Share (IEC\backslashNSFC\backslash181415).
Corresponding Authors:  Yao-Chun Shen     E-mail:  ycshen@liverpool.ac.uk

Cite this article: 

Yao-Chun Shen(沈耀春), Xing-Yu Yang(杨星宇), Zi-Jian Zhang(张子健) Broadband terahertz time-domain spectroscopy and fast FMCW imaging: Principle and applications 2020 Chin. Phys. B 29 078705

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