Second Order Nonlinear Optical Performances of Polymers Containing Imidazole and Benzimidazole Chromophores

✍ Scribed by Antonio Carella; Roberto Centore; Augusto Sirigu; Angela Tuzi; Alessia Quatela; Stefano Schutzmann; Mauro Casalboni

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 139 KB
• Volume: 205
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200400129

✦ Synopsis

Abstract

Summary: Condensation polymers based on two different NLO‐active chromophores, namely 2‐[4‐[(4‐N,N‐dihydroxyethylamino)phenylazo]phenyl]‐5(6)‐nitrobenzimidazole (BZI) and 2‐[4‐(4‐N,N‐dihydroxyethylamino)phenylazo]‐4,5‐dicyanoimidazole (IMI), have been synthesized and their basic properties measured. The second order NLO properties of poled polymers were investigated by SHG procedures at different temperatures (35, 65 and 85 °C) and exposure times. Resonance free d~33~ coefficients (λ = 1 368 nm) took values in the range 1.8–4.0 pm · V^−1^, but the time stability of their SHG signal was fairly acceptable, particularly for the high T~g~ (e.g. 188 °C) polymer for which a relaxation time (at 25 °C) of 2.8 years has been determined.

BZI and IMI chromophores.

magnified imageBZI and IMI chromophores.