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Optics Letters

Optics Letters


  • Vol. 25, Iss. 12 — Jun. 15, 2000
  • pp: 911–913

Far-infrared properties of DAST

Markus Walther, Kasper Jensby, Søren Rud Keiding, Hidenori Takahashi, and Hiromasa Ito  »View Author Affiliations

Optics Letters, Vol. 25, Issue 12, pp. 911-913 (2000)

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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.

© 2000 Optical Society of America

OCIS Codes
(160.4330) Materials : Nonlinear optical materials
(300.6270) Spectroscopy : Spectroscopy, far infrared
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

Markus Walther, Kasper Jensby, Søren Rud Keiding, Hidenori Takahashi, and Hiromasa Ito, "Far-infrared properties of DAST," Opt. Lett. 25, 911-913 (2000)

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