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NLO Behavior of Polymers Containing Y‐Shaped Chromophores |
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| Authors: | Antonio Carella Fabio Borbone Ugo Caruso Roberto Centore Antonio Roviello Alberto Barsella Alessia Quatela |
| Affiliation: | 1. Dipartimento di Chimica, Università di Napoli “Federico II”, 80126, Via Cintia, Napoli, ItalyDipartimento di Chimica, Università di Napoli “Federico II”, 80126, Via Cintia, Napoli, Italy.;2. Dipartimento di Chimica, Università di Napoli “Federico II”, 80126, Via Cintia, Napoli, Italy;3. IPCMS‐CNRS, Groupe d'Optique Nonlinèare et Optoelèctronique, 23 Rue du Loess, 67037 Strasbourg Cedex, France;4. Dipartimento di Fisica Università di Roma “Tor Vergata”, Via della Ricerca Scientifica 1, 00133 Roma, Italy |
| Abstract: | New polyurethanes containing Y‐shaped chromophores, symmetrical derivatives of 4‐(dicyanomethylene)‐2‐methyl‐6‐[p‐(dimethylamino)styryl]‐4H‐pyran, have been prepared. The polymers show high glass transition temperatures (Tg) and a good thermal stability. SHG measurements on poled polymer films of the synthesized polymers have been carried out and a maximum d33 of 15 pm · V?1 has been found at 1 368 nm fundamental wavelength. Time stability measurements on the most active polymer have shown that after the initial fast relaxation, the d33 value remains constant at 80 °C for 60 d.  |
| Keywords: | NLO polyurethanes SHG synthesis Y‐shaped chromophores |