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Optical Engineering

Evaluation of human hairs with terahertz wave
Author(s): Kazunori Serita; Hironaru Murakami; Iwao Kawayama; Yoshinori Takahashi; Masashi Yoshimura; Yusuke Mori; Masayoshi Tonouchi
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Paper Abstract

Single human hairs using a scanning laser terahertz (THz) imaging system are evaluated. The system features near-field THz emission and far-field THz detection. A sample is set in the vicinity of a two-dimensional THz emitter, and an excitation laser beam is scanned over the emitter via a galvanometer. By detecting the transmitted THz wave pulses that are locally generated at the irradiation spots of the excitation laser, we can obtain the THz transmission image and the spectrum of the sample with imaging time of 47 s for 512×512  pixels and maximum resolution of ∼27  μm . Using the system, we succeeded in observing the specific features of single human hairs in both the THz transmittance spectra and transmission images; it was found that the THz transmittance spectrum of gray hair shows a tendency of increase while that of black hair shows a decrease with increasing frequency above 1.2 THz. We could also observe the change of the moisture retention in the hair, and it is found that cuticles play one of the important roles in keeping moisture inside the hair. Those obtained data indicate that our system can be useful for evaluating single human hairs and those kinds of microscale samples.

Paper Details

Date Published: 4 November 2013
PDF: 7 pages
Opt. Eng. 53(3) 031205 doi: 10.1117/1.OE.53.3.031205
Published in: Optical Engineering Volume 53, Issue 3
Show Author Affiliations
Kazunori Serita, Osaka Univ. (Japan)
Hironaru Murakami, Osaka Univ. (Japan)
Iwao Kawayama, Osaka Univ. (Japan)
Yoshinori Takahashi, Osaka Univ. (Japan)
Masashi Yoshimura, Osaka Univ. (Japan)
Yusuke Mori, Osaka Univ. (Japan)
Masayoshi Tonouchi, Osaka Univ. (Japan)

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