Fig. 1

a Visible light images of glycerin-based phantoms and the b real and c imaginary parts of dielectric permittivities at frequencies from 0.1 to 0.6 THz. The mean values and standard deviations are shown (n = 10).

a Visible light images of glycerin-based phantoms and the b real and c imaginary parts of dielectric permittivities at frequencies from 0.1 to 0.6 THz. The mean values and standard deviations are shown (n = 10).