The sub-THz frequency behavior of human sweat ducts

In the interaction of microwave radiation and human beings, the skin is traditionally considered as just an absorbing sponge stratum filled with water. This approach is justified when the impinging wavelength is greater than the dimensions of the skin layer. However, in the sub-THz band this condition is violated. In 2008, we demonstrated that the coiled portion of the sweat duct in upper skin layer could be regarded as an electromagnetic entity in the sub-THz band. The experiments linking the morphology of the eccrine sweat ducts to stress based variations in the reflection coefficient of the human palm, conducted in the frequency range of 75 GHz to 430 GHz. An intriguing finding in this experimental series was the demonstration of circular dichroism in the reflectance of the skin, significant because the helical structure of the sweat duct. We designed a simulation model that can provide us with both possibilities to study absorbance and emission of sub-THz radiation by Human Skin. Considering the helical duct as an electromagnetic entity, it dimensions dictate a characteristic frequency of absorption. The simulated frequency spectra qualitatively match the measured emission and reflected spectra.

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