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Spectroscopic measurements and terahertz imaging of the cornea using a rapid scanning terahertz time domain spectrometer

Authors :
Jiancheng Lv
Chen Sihai
Jiao Guohua
Dong Yuming
Lu Yuanfu
Liu Wenquan
Xianfeng Chen
Zhou Zhisheng
Rongbin She
Jin-Ying Li
Source :
Chinese Physics B. 25:060702
Publication Year :
2016
Publisher :
IOP Publishing, 2016.

Abstract

Spectroscopic measurements and terahertz imaging of the cornea are carried out by using a rapid scanning terahertz time domain spectroscopy (THz-TDS) system. A voice coil motor stage based optical delay line (VCM-ODL) is developed to provide a rather simple and robust structure with both the high scanning speed and the large delay length. The developed system is used for THz spectroscopic measurements and imaging of the corneal tissue with different amounts of water content, and the measurement results show the consistence with the reported results, in which the measurement time using VCM-ODL is a factor of 360 shorter than the traditional motorized optical delay line (MDL). With reducing the water content a monotonic decrease of the complex permittivity of the cornea is observed. The two-term Debye relaxation model is employed to explain our experimental results, revealing that the fast relaxation time of a dehydrated cornea is much larger than that of a hydrated cornea and its dielectric behavior can be affected by the presence of the biological macromolecules. These results demonstrate that our THz spectrometer may be a promising candidate for tissue hydration sensing and practical application of THz technology.

Details

ISSN :
16741056
Volume :
25
Database :
OpenAIRE
Journal :
Chinese Physics B
Accession number :
edsair.doi...........ed6d2008925a8a58507f4c94b31f73e3