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Proceedings Paper

Frequency of resonance of human sweat duct in different modes of operation
Author(s): Saroj R. Tripathi; Shogo Takahashi; Kento Kinumura; Kodo Kawase
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Paper Abstract

Recently, some studies have demonstrated that the sweat ducts present in the skin play a significant role in terahertz (THz) wave interaction with human beings. It was reported that the sweat ducts act as a low-Q-factor helical antenna due to their helical structure, and resonate in the sub-terahertz frequency range according to their structural parameters, such as helix diameter and helix length. According to the antenna theory, a helical antenna resonates in two different modes of operation known as normal mode and axial mode and the dimension of the helix plays a key role to determine the frequency of resonance. Therefore, here we performed the optical coherence tomography (OCT) of number of human subjects on their palm and foot to investigate the density, distribution and morphological features of sweat ducts. Moreover, we calculated the dielectric properties of human skin using terahertz time domain spectroscopy. Based on the structural parameters of human sweat ducts and its THz dielectric properties of surrounding medium, we computed the frequency of resonance of sweat duct in different modes of operation and we found that these ducts resonate in subterahertz frequency region. We believe that these findings will facilitate further investigation of the THz-skin interaction and provide guidelines for safety levels with respect to human exposure to electromagnetic waves at these frequencies.

Paper Details

Date Published: 13 February 2018
PDF: 5 pages
Proc. SPIE 10492, Optical Interactions with Tissue and Cells XXIX, 104920I (13 February 2018);
Show Author Affiliations
Saroj R. Tripathi, Shizuoka Univ. (Japan)
Shogo Takahashi, Shizuoka Univ. (Japan)
Kento Kinumura, Shizuoka Univ. (Japan)
Kodo Kawase, Nagoya Univ. (Japan)

Published in SPIE Proceedings Vol. 10492:
Optical Interactions with Tissue and Cells XXIX
E. Duco Jansen; Hope Thomas Beier, Editor(s)

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