The Sub-THz Emission of the Human Body under Physiological Stress

Ksenia A. Baksheeva, Roman V. Ozhegov, Gregory N. Goltsman, Nickolay V. Kinev, Valery P. Koshelets, Anna Kochnev, Noa Betzalel, Alexander Puzenko, Paul Ben Ishai, Yuri Feldman

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We present evidence that in the sub-THz frequency band, human skin can be considered as an electromagnetic bio-metamaterial in which its natural emission is a product of skin tissue geometry and embedded structures. Radiometry was performed on 32 human subjects from 480 to 700 GHz. Concurrently, the subjects were exposed to stress, while heart pulse rate (PS) and galvanic skin response (GSR) were also measured. The results are substantially different from the expected blackbody radiation signal of the skin surface. PS and GSR correlate to the emissivity. Using a simulation model for the skin, we find that the sweat duct is a critical element. The simulated frequency spectra qualitatively match the measured emission spectra and show that our sub-THz emission is modulated by our level of mental stress. This opens avenues for the remote monitoring of the human state.

Original languageEnglish
Article number9380570
Pages (from-to)381-388
Number of pages8
JournalIEEE Transactions on Terahertz Science and Technology
Volume11
Issue number4
DOIs
StatePublished - Jul 2021

Keywords

  • Black body radiation
  • human skin emission
  • sub-THz
  • sweat ducts

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