Far-infrared properties of DAST

Using terahertz time-domain spectroscopy, we have measured the index of refraction and the absorption coefficient of the organic ionic salt 4-N, N-dimethylamino-4?-N?-methyl-stilbazolium tosylate (DAST). This promising organic electro-optic material exhibits strong absorption and dispersion for freq...

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Bibliographic Details
Published in:Optics letters 2000-06, Vol.25 (12), p.911-913
Main Authors: Walther, M, Jensby, K, Keiding, S R, Takahashi, H, Ito, H
Format: Article
Language:English
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Summary:Using terahertz time-domain spectroscopy, we have measured the index of refraction and the absorption coefficient of the organic ionic salt 4-N, N-dimethylamino-4?-N?-methyl-stilbazolium tosylate (DAST). This promising organic electro-optic material exhibits strong absorption and dispersion for frequencies above 1 THz at both room temperature and 83 K. No reduction in the absorption strength is observed when DAST is cooled, suggesting a single-phonon origin of the resonances. A simple vibration of the anion and cation of the salt is suggested as the origin of the exceptionally strong far-infrared absorption and the high-frequency electro-optic properties of DAST.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.25.000911