作者
Daehoon Han, Kanghee Lee, Jongseok Lim, Sei Sun Hong, Young Kie Kim, Jaewook Ahn
发表日期
2013/12/20
期刊
Applied Optics
卷号
52
期号
36
页码范围
8670-8675
出版商
Optica Publishing Group
简介
Terahertz (THz) time-domain spectroscopy probes the optical properties of naturally occurring solid aggregates of minerals, or stones, in the THz frequency range. Refractive index and extinction coefficient measurement reveals that most natural stones, including mudstone, sandstone, granite, tuff, gneiss, diorite, slate, marble, and dolomite, are fairly transparent for THz frequency waves. Dolomite in particular exhibits a nearly uniform refractive index of 2.7 over the broad frequency range from 0.1 to 1 THz. The high index of refraction allows flexibility in lens designing with a shorter accessible focal length or a thinner lens with a given focal length. Good agreement between the experiment and calculation for the THz beam profile confirms that dolomite has high homogeneity as a lens material, suggesting the possibility of using natural stones for THz optical elements.
学术搜索中的文章
D Han, K Lee, J Lim, SS Hong, YK Kim, J Ahn - Applied Optics, 2013