The European Physical Journal Applied Physics

Table of Contents - December 2008 - Volume 44, Issue 03  

Photonics

Photoinduced changes in a Sudan I doped PMMA thin film

T. Hea1, C. Wanga1, X. Pana1 and Y. Wanga1

Department of physics, Shanghai Jiao Tong University, Shanghai 200240, P.R. China

Abstract

Photoinduced changes in a Sudan I doped PMMA thin film were investigated. The dependence of photoinduced birefringence of the thin film on light intensity was studied, with a continuous wave (CW) 532 nm laser as pump light and a CW 650 nm laser as probe light. For all the light intensities (100–1000 mW/cm2), the thin film possessed large photoinduced birefringence (Δn ~ 10−4). With a CW 532 nm laser at relatively low light intensity, a reversible polarization hologram has been recorded in the thin film. Moreover, Z-scan measurements showed that the thin film possessed large nonlinear refractive index (−7.93 × 10−5  cm 2/W) and nonlinear absorption coefficient (−5.50 W/cm) under a CW 532 nm excitation.

(Received May 5 2008)

(Revised July 24 2008)

(Accepted September 16 2008)

(Online publication December 6 2008)

PACS:

  • 78.20.Fm – Birefringence;
  • 42.40.Ht – Hologram recording and readout methods;
  • 42.70.Ln – Holographic recording materials; optical storage media;
  • 42.65.Jx – Beam trapping, self-focusing and defocusing; self-phase modulation

cswang@sjtu.edu.cn