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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 25 — Dec. 8, 2008
  • pp: 20724–20733

Optical absorption photoacoustic measurements for determination of molecular symmetries in a dichroic organic-film

Vicente Torres-Zúñiga, Rosalba Castañeda-Guzmán, S. Jesús Pérez-Ruiz, Omar G. Morales-Saavedra, and Manuel Zepahua-Camacho  »View Author Affiliations


Optics Express, Vol. 16, Issue 25, pp. 20724-20733 (2008)
http://dx.doi.org/10.1364/OE.16.020724


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Abstract

A novel approach to specify symmetries and main optical axes in anisotropic polymeric films is proposed. This method is based on the analysis of the optical absorption via the pulsed laser photoacoustic (PLPA)-technique in a common polarizer film, while rotating the polarizer axis at normal incidence. Since the PLPA-signals are directly proportional to the optical absorption, it is shown that a symmetric and complementary Malus’s law can be obtained over full root mean square (RMS)- and correlation (CA)-analysis of the PLPA-signals. Such data processing reveals the main material directions of the constituting film molecules defining the symmetry structure of the sample. PLPA-results were compared to the pure optical transmission experiments and show unambiguous information, allowing this technique to be used in nonstandard and opaque polymeric films, where the analysis of the optical measurements represents a difficult task, and in general, in anisotropic media.

© 2008 Optical Society of America

OCIS Codes
(160.1190) Materials : Anisotropic optical materials
(160.5470) Materials : Polymers
(260.0260) Physical optics : Physical optics
(260.5430) Physical optics : Polarization
(310.0310) Thin films : Thin films
(310.5448) Thin films : Polarization, other optical properties

ToC Category:
Materials

History
Original Manuscript: September 23, 2008
Revised Manuscript: November 10, 2008
Manuscript Accepted: November 19, 2008
Published: December 1, 2008

Citation
Vicente Torres-Zúñiga, Rosalba Castañeda-Guzmán, S. Jesús Pérez-Ruiz, Omar G. Morales-Saavedra, and Manuel Zepahua-Camacho, "Optical absorption photoacoustic measurements for determination of molecular symmetries in a dichroic organic-film," Opt. Express 16, 20724-20733 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-25-20724


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References

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