Title :
Terahertz frequency optical constants of montmorillonite
Author :
Wilke, Ingrid ; Ramanathan, Vignesh ; LaChance, Julienne ; Aldersley, Michael F. ; Joshi, P.C. ; Ferris, James P.
Author_Institution :
Rensselaer Polytech. Inst., Troy, NY, USA
Abstract :
The real and imaginary parts of the complex index of refraction of montmorillonite between 0.2 THz and 1.4 THz at room temperature are reported. The optical properties of montmorillonite in this frequency range were experimentally determined using time-domain THz spectroscopy. Distinct frequency dependencies of the index of refraction and the extinction coefficient are not observed within the uncertainties of the measurements. The index of refraction of montmorillonite is modeled using effective medium theory.
Keywords :
clay; extinction coefficients; refractive index; terahertz wave spectra; clay mineral; effective medium theory; extinction coefficient; frequency 0.2 THz to 1.4 THz; montmorillonite; optical constants; optical properties; refraction index; temperature 293 K to 298 K; terahertz frequency; time-domain terahertz spectroscopy; Frequency measurement; Indexes; Laser excitation; Measurement by laser beam; Minerals; Optical refraction; Spectroscopy; absorption; clay minerals; montmorillonite; optical constants; terahertz spectroscopy;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2013 38th International Conference on
Conference_Location :
Mainz
DOI :
10.1109/IRMMW-THz.2013.6665581
