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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 13 — Jun. 22, 2009
  • pp: 10642–10647

Molecular orientation in self-assembled multilayers measured by Second Harmonic generation using femtosecond pulses.

Catalina von Bilderling, Mario Tagliazucchi, Ernesto J. Calvo, and Andrea V. Bragas  »View Author Affiliations


Optics Express, Vol. 17, Issue 13, pp. 10642-10647 (2009)
http://dx.doi.org/10.1364/OE.17.010642


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Abstract

We present measurements of the optical second-harmonic generation in self assembled multilayer films of PAZO/PAH polymers with the aim to investigate molecular order in the layer-by-layer architecture. The experiments are performed in transmission, using a femtosecond Ti:Sa pulsed laser, which allows a more accurate determination of the amplitude of the second harmonic signal, without interference fringes usually present in nanosecond experiments. We found that the first bilayer, in contact with the substrate, presents a broad distribution of the orientation of the molecules, while the addition of successive bilayers (up to 12) produces ordering of the molecules with a small tilt angle respect to the surface normal. This result, together with the monotonic increment of the second harmonic signal with the number of layers indicates that the molecules grow orderly assembled in these films.

© 2009 Optical Society of America

OCIS Codes
(190.4400) Nonlinear optics : Nonlinear optics, materials
(310.6860) Thin films : Thin films, optical properties
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

ToC Category:
Nonlinear Optics

History
Original Manuscript: April 2, 2009
Revised Manuscript: May 8, 2009
Manuscript Accepted: May 31, 2009
Published: June 10, 2009

Citation
Catalina von Bilderling, Mario Tagliazucchi, Ernesto J. Calvo, and Andrea V. Bragas, "Molecular orientation in self-assembled multilayers measured by Second Harmonic generation using femtosecond pulses.," Opt. Express 17, 10642-10647 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-13-10642


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