Boson Peak Detection of Colored Craft Glass by Terahertz Time-Domain Spectroscopy

We performed terahertz time-domain spectroscopy (THz-TDS) on two different soda-lime glass plates. One of the glasses is transparent and the other is black. In addition, terahertz imaging was performed on the two-color integrated glass plate. It was found that the metallic element added to the black glass almost does not affect the absorption coefficient around the terahertz region. Based on the obtained results of the glass samples by THz-TDS, we found a clear boson peak structure in the $\alpha(v)/v^{2}$ spectrum, where $\alpha$ is the absorption coefficient. This result shows that the boson peak imaging is possible by THz-TDS without being affected by the color in the visible light region which causes a problem in the low-frequency Raman scattering.