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Register a new userStability of Photoinduced Orientation of Poly (methyl methacrylate)/ Solvent Red 23Thin Films
استقرارية التوجيه المحثوث ضوئياً في الأفلام الرقيقة لبولي ميثيل ميثاكريليت/سولفنت رد 23
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Damascus University ورقة بحثية
Publication date
2014
fields
Physics
and research's language is
العربية
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Shamra Editor
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استكشف تأثير التوجيه المحثوث ضوئياً العكوس لصباغ سولفنت رد 23 (Solvent Red 23) المتحد مع بوليمر البولي ميثيل ميثاكريليت (Poly(methyl methacrylate)) في الأفلام الرقيقة. استخدمت منظومة ضخ-سبر لاستقصاء السلوك اللوناني للعينات. يولد الضوء الليزري المستقطب عمودياً ازدياداً أصغر في شدة الشعاع النافذ. جرى توليد بنية قطبية أقوى باستخدام أشعة ضخ-سبر ليزرية متوازية، مقارنة بحالة الأشعة المتعامدة. وجد أن قيمة نسبة اللونانية للمنظومة البوليميرية تبلغ 4.952 التي تشير إلى أن التوجة المحصل لجزيئات الصباغ العضوي معامدة لاتجاه شعاع حقل حزمة ضوء الليزر. يظهر التطور الحركي لنسبة اللونانية أن استرخاءها بطيء، و يتدهور بشكل لوغاريتمي بطيء، و الذي يمكن أن يستمر وقتاً طويلاً جداً للوصول إلى الحالة المتناحية.
The effect of the reversible photo-orientation of the Solvent Red 23 dye incorporated in Poly (methyl methacrylate) thin films has been investigated. A probe-pump optical system was used to investigate the dichroic behavior of the samples. Orthogonal polarized laser light induces a smaller increase in the transmitted beam intensity. A stronger polar order was induced using a parallel pump-probe laser light compared to that of the perpendicular state. It was found that the dichroic ratio value of the Poly (methyl methacrylate) / Solvent Red 23 thin film is 4.952, which indicates that the net orientation of Solvent Red 23 molecules is orthogonal to the applied beam field. The dynamic evolution of the dichroic ratio showed that the relaxation is rather slow, and it deteriorates in a slow logarithmic fashion, which may take a very long time in order to reach the isotropic state.
References used
Zhao, Y. and Ikeda, T.2009. Smart light-responsive materials: Azobenzenecontaining polymers and liquid crystals (Wiley, New Jersey, USA) p. 514
Ahmad, F. Jamil, M., JaeJeon, Y. Jin Woo, L. Eun Jung, J. and Eun Jang, J. 2012. Investigation of nonionic diazo dye-doped polymer dispersed liquid crystal film, Bull. Mater. Sci., V. 35, No. 2, pp. 221–231
Cojocariu, C. and Rochon, P. 2004. Light-induced motions in azobenzene containing polymers, Pure Appl. Chem., V. 76, No. 7–8, pp. 1479–1497
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