Abstract

In this study we discuss the transmittance, the refractive index of seven ancient paper sheets and five modern paper sheets made in ancient technology in the interval 5–85cm-1 and 300–1000cm-1, with terahertz time-domain spectroscopy in transmission mode and Fourier-transform infrared spectroscopy in transmission mode. By analyzing the optical characteristics of these twelve paper sheets, we discuss the link between the ancient and modern paper.

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