Terahertz Wave Approach and Application on FRP Composites

Table 1

Average THz refractive indices of the material studied.

Materials	Refractive index (𝑛)*	Refractive index (𝑛)
		Through-transmission mode	Reflection mode
PMMA	1.60±0.08	1.61±0.07	1.62±0.03
Fused quartz	1.95±0.05	1.95±0.05	1.94±0.05
GFRP	—	2.13±0.05	2.12±0.05

^∗Known data by [8, 9].