"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Dynamic photoinduced anisotropy in PMMA/disperse red 13 thin films

B. ABBAS1,* , M. ALSHIKH KHALIL1

Affiliation

  1. Department of Physics, Atomic Energy Commission, P. O. Box 6091, Damascus, Syria

Abstract

The photoinduced anisotropy’s dynamics of PMMA/Disperse Red 13 (PMMA/DSR13) thin films were investigated by the pump-probe method. The anisotropy increased exponentially at the start of pumping, and reached a photostationary state due to the photoisomerization process. However, anisotropy decreased exponentially as soon as the irradiation was switched off. It was concluded that the Angular Hole Burning (AHB) and the Angular Redistribution (AR) effects are re-sponsible for the observed dynamic photoinduced anisotropy (POA). Moreover, the relative POA revealed that the pho-toisomer’s thermal isotropic relaxation was insignificant, in comparison with the anisotropic reversible photoisomeriza-tion that occurred at cutting-off the pump..

Keywords

Photoinduced anisotropy, Photoisomerization, Angular hole burning (AHB), Angular redistribution (AR).

Submitted at: March 6, 2025
Accepted at: Dec. 4, 2005

Citation

B. ABBAS, M. ALSHIKH KHALIL, Dynamic photoinduced anisotropy in PMMA/disperse red 13 thin films, Journal of Optoelectronics and Advanced Materials Vol. 27, Iss. 11-12, pp. 521-528 (2025)