Title :
Precise Determination of the Refractive Index of Samples Showing Low Transmission Bands by THz Time-Domain Spectroscopy
Author :
Bernier, Martin ; Garet, F. ; Coutaz, Jean-Louis
Author_Institution :
IMEP-LAHC, Univ. of Savoie, Le Bourget du Lac, France
Abstract :
In this paper, we propose a method to determine the refractive index and the absorption coefficient of samples showing spectral bands of very low transmission. The method, takes advantages of both transmission and reflection terahertz time-domain spectroscopy (THz-TDS) to obtain more precise optical constants than when only reflection measurement is used. It has been then validated using pellets made of maltose, which exhibits resonant lines within the THz spectral range.
Keywords :
absorption coefficients; organic compounds; reflection; refractive index; terahertz wave spectra; visible spectra; absorption coefficient; low-transmission bands; maltose; optical constants; pellets; precise determination; reflection measurement; reflection terahertz time-domain spectroscopy; refractive index; Absorption; Data mining; Frequency measurement; Materials; Mirrors; Phase measurement; Refractive index; Material characterization; THz time-domain spectroscopy (THz-TDS); reflection spectroscopy; transmission spectroscopy;
Journal_Title :
Terahertz Science and Technology, IEEE Transactions on
DOI :
10.1109/TTHZ.2013.2247793
