Optimal methodologies for terahertz time-domain spectroscopic analysis of traditional pigments in powder form

Taewoo Ha, Howon Lee, Kyung Ik Sim, Jonghyeon Kim, Young Chan Jo, Jae Hoon Kim, Na Yeon Baek, Dai ill Kang, Han Hyoung Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We have established optimal methods for terahertz time-domain spectroscopic analysis of highly absorbing pigments in powder form based on our investigation of representative traditional Chinese pigments, such as azurite [blue-based color pigment], Chinese vermilion [red-based color pigment], and arsenic yellow [yellow-based color pigment]. To accurately extract the optical constants in the terahertz region of 0.1 - 3 THz, we carried out transmission measurements in such a way that intense absorption peaks did not completely suppress the transmission level. This required preparation of pellet samples with optimized thicknesses and material densities. In some cases, mixing the pigments with polyethylene powder was required to minimize absorption due to certain peak features. The resulting distortion-free terahertz spectra of the investigated set of pigment species exhibited well-defined unique spectral fingerprints. Our study will be useful to future efforts to establish non-destructive analysis methods of traditional pigments, to construct their spectral databases, and to apply these tools to restoration of cultural heritage materials.

Original languageEnglish
Pages (from-to)866-871
Number of pages6
JournalJournal of the Korean Physical Society
Volume70
Issue number9
DOIs
Publication statusPublished - 2017 May 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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