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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 36 — Dec. 20, 2008
  • pp: 6680–6691

Unconditionally stable indole-derived glass blends having very high photorefractive gain: the role of intermolecular interactions

Rocco Angelone, Francesco Ciardelli, Arturo Colligiani, Francesco Greco, Paolo Masi, Annalisa Romano, Giacomo Ruggeri, and Jean-Louis Stehlé  »View Author Affiliations

Applied Optics, Vol. 47, Issue 36, pp. 6680-6691 (2008)

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The photorefractivity of an indole derivative and of its polymer blends has been studied at room temperature. The indole derivative 3-[2-(4-nitrophenyl)ethenyl]-1-(2-ethylhexyl)-2-methylindole (NPEMI-E) is a typical low-molecular-weight glass-forming molecule having peculiar nonlinear optics characteristics. It is unconditionally soluble in the photoconductive poly-(N-vinyl-2,3-dimethylindole) so that all the possible blends can be studied for a weight percent (wt. %) content of NPEMI-E ranging from zero to 100. A very high and sharp maximum of the photorefractive optical gain Γ 2 2000 cm 1 was obtained for a NPEMI-E wt. % content of about 90. On the basis of recently published theoretical calculations, we have made the hypothesis that the rapid change of Γ 2 can also be ascribed to a correspondingly quick variation of the molecular electro-optic parameters of the dissolved chromophore for some well distinguished values of its concentration in the polymer matrix. Differential scanning calorimetry measurements were made and the results carefully analyzed with the aim of obtaining information on the intermolecular interactions. These last measurements also allowed rationalizing the unconditionally stable glass appearance of the obtained blends. Measurements of spectroscopic ellipsometry were also made on blends with different NPEMI-E content.

© 2008 Optical Society of America

OCIS Codes
(160.4330) Materials : Nonlinear optical materials
(160.5140) Materials : Photoconductive materials
(160.5320) Materials : Photorefractive materials
(190.3270) Nonlinear optics : Kerr effect
(190.5330) Nonlinear optics : Photorefractive optics
(230.4480) Optical devices : Optical amplifiers

ToC Category:

Original Manuscript: July 15, 2008
Revised Manuscript: September 4, 2008
Manuscript Accepted: November 4, 2008
Published: December 11, 2008

Rocco Angelone, Francesco Ciardelli, Arturo Colligiani, Francesco Greco, Paolo Masi, Annalisa Romano, Giacomo Ruggeri, and Jean-Louis Stehlé, "Unconditionally stable indole-derived glass blends having very high photorefractive gain: the role of intermolecular interactions," Appl. Opt. 47, 6680-6691 (2008)

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