Abstract
This work is devoted to investigation of optical properties (dispersion of refractive index, permittivity and absorption coefficient) of human nails in THz frequency range. These data were obtained by THz time-domain spectroscopy (TDS) technique in transmission mode. These results may be used to develop non-invasive technique of human pathologies control using nail as a reference sample in reflection mode of THz TDS.
Highlights
Diabetes mellitus is a group of metabolic diseases characterized by hyperglycemia resulting from defects in insulin secretion, insulin action, or both [1]
In the Ref. [14] it was shown only the refractive index and the dispersion of the absorption coefficient obtained using reflection THz time-domain spectroscopy (TDS) in the frequency range of 0.25 – 2.0 THz. It this paper we obtained all optical properties as dispersions such as the complex refractive index n(f), the absorption coefficient α(f), the penetration depth L(f), the complex permittivity ε(f)
The dispersions of nail plates optical properties (the complex refractive index n(f), the absorption coefficient α(f), the penetration depth L(f), the complex permittivity ε(f)) were obtained in the frequency range of 0.2 – 1 THz by THz TDS. These data will be helpful for development of the reflective non-invasive spectroscopic method of blood glucose measuring technique
Summary
Diabetes mellitus is a group of metabolic diseases characterized by hyperglycemia resulting from defects in insulin secretion, insulin action, or both [1]. “Catalogue of human tissue optical properties at terahertz frequencies,” Journal of Biological Physics 29(2-3), 123–128 (2003). K. Khodzitsky, “Blood optical properties at various glucose level values in THz frequency range,” Proc. K. Khodzitsky, “Influence of creatinine and triglycerides concentrations on blood optical properties of diabetics in THz frequency range,” Journal of Physics: Conference Series 735, 012088 (2016).
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