Two-photon induced anisotropy in PMMA film doped with Disperse Red 13

✍ Scribed by C.R. Mendonça; U.M. Neves; L. De Boni; A.A. Andrade; D.S. dos Santos Jr.; F.J. Pavinatto; S.C. Zilio; L. Misoguti; O.N. Oliveira Jr.

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 214 KB
• Volume: 273
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2007.01.035

✦ Synopsis

In this paper we present optical anisotropy induced by 150-fs laser pulses operating at 775 nm in poly(methyl methacrylate) (PMMA) films doped with Disperse Red 13 (DR13). Two-photon absorption of DR13 induces reversible birefringence in the sample, a feature associated with the molecular orientation caused by isomerization of the azochromophores. No irreversible anisotropy, associated with photobleaching of the chromophore was observed. The slope of 2 obtained for the induced birefringence as a function of the excitation irradiance corroborates the two-photon nature of the process.