Spectroscopy of excised skin patches exposed to THz and far-IR radiation.

Applications of far infrared (Far-IR) and terahertz (THz) radiation in areas such as healthcare and security are fast-growing. As a consequence, humans and the environment are becoming more exposed to mm-wave and Far-IR radiation than previously. We examined typical skin-care and sunscreen ingredients and propitiatory products with transmission FTIR, ATR-FTIR and THz-time domain spectroscopy (THz-TDS) methods using fresh and dehydrated toad and fresh human skin samples for their absorption properties in these frequency ranges. The skin hydration compounds glycerol and sorbitol have comparable absorption characteristics to physiological bulk water. Products containing these and similar hydrating compounds have significant Far-IR absorption characteristics. The sunscreen ingredients ZnO (20 micron), TiO

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© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Déclaration de conflit d'intérêts

The authors declare no conflicts of interest and no competing financial interest. A.L. and A.W. conceived the experiments, A.L., Z.V. and A.R. conducted the experiments, A.L. analysed experimental data, A.L, Z.V., D.A., S.J., J.D. and A.W. contributed in the result discussion, A.L. prepared the manuscript. All authors reviewed the manuscript.