Electric-field induced birefringence in azobenzene thin films

Paulo M. Zagalo, Gonçalo Magalhães-Mota, Susana Sério, Paulo A. Ribeiro, Maria Raposo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

It has been recently shown that solar light is able to induce a small birefringence in azo-benzene chromophore containing thin films, parallel to its surface. In order to enhance this effect, towards the development of energy harvesting devices, poly (1-(4-(3-carboxy-4-hydroxy-phenylazo)benzenesulfonamido)-1,2-ethanediyl, sodium salt) (PAZO) cast films were thermally polarized to achieve a net dipole moment in the medium. Therefore, creation and relaxation kinetics curves of PAZO cast films were obtained in terms of poling at different temperatures and applied voltages. Results show that the maximum birefringence induced is proportional to both temperature and applied external electrical field while the relaxation curves reveal that the residual birefringence increases with the temperature, behaviour which is indicative of cooperative orientation processes between the chromophores which in turn guarantees the stability of chromophores orientation.

Original languageEnglish
Title of host publicationPHOTOPTICS 2017 - Proceedings of the 5th International Conference on Photonics, Optics and Laser Technology
EditorsDavid Andrews, Paulo A. Ribeiro, Maria Raposo
PublisherSciTePress
Pages381-385
Number of pages5
Volume2017-January
ISBN (Electronic)978-989758223-3
Publication statusPublished - 1 Jan 2017
Event5th International Conference on Photonics, Optics and Laser Technology, PHOTOPTICS 2017 - Porto, Portugal
Duration: 27 Feb 20171 Mar 2017

Conference

Conference5th International Conference on Photonics, Optics and Laser Technology, PHOTOPTICS 2017
CountryPortugal
CityPorto
Period27/02/171/03/17

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Keywords

  • Azobenzene
  • Birefringence
  • Energy Harvesting
  • PAZO
  • Thin Films

Cite this

Zagalo, P. M., Magalhães-Mota, G., Sério, S., Ribeiro, P. A., & Raposo, M. (2017). Electric-field induced birefringence in azobenzene thin films. In D. Andrews, P. A. Ribeiro, & M. Raposo (Eds.), PHOTOPTICS 2017 - Proceedings of the 5th International Conference on Photonics, Optics and Laser Technology (Vol. 2017-January, pp. 381-385). SciTePress.