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首页> 外文会议>Nanobiosystems: Processing, characterization, and applications IX >Tunable lasers based on hemicyanines embedded in DNA complex
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Tunable lasers based on hemicyanines embedded in DNA complex

机译：基于嵌入DNA复合物中的半菁的可调谐激光器

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Fluorescence yields of many organic dyes are enhanced via incorporation into DNA-surfactant complex which also extends the lifetime of the dyes. We have developed wavelength tunable lasers with hemicyanine dyes embedded in DNA-cetyltrimethylammonium (DNA-CTMA). A couple of methods were applied to the dye doping, leading to different modes of interaction with DNA or its complex. Even though optical properties depended on the material structure reflecting preparation method, dyes showed good performance as laser media in various cases. Therefore, it is important to study the details of their interaction mechanism and the effects on their lasing performance. In order to investigate the interaction mode, three types of dyes were employed, that is, 4-[4-(dimethylamino)stylyl]-l-methylpyridinium iodide (DMASMPI or p-Hemil), 2-[4-(dimethylamino)styryl]-1-methylpyridinium iodide (o-Hemil), and 2-(4-dimethylaminostyryl)-l-ethylquinolinium iodide (Quinaldine Red). Strong fluorescence enhancement and spectral shift of the dyes interacting with DNA in water suggested the importance of direct binding to DNA, while the dyes showed strongest fluorescence emission without significant spectral shift when interacting with DNA-CTMA in ethanol. The facts implied that multiple origins of fluorescence enhancement could be applicable to build up lasers. DNA-CTMA thin films incorporating the dyes were fabricated with several different methods aiming to control the interaction modes of the dye. p-Hemil doped thin films with 'immersion method' gave light amplification and laser oscillations in the range 590-620nm under optical pumping. The films operated more than 1 hour before the output stimulated emission diminished, showing strong durability of the dye in the complex.
机译：通过掺入DNA表面活性剂复合物中，可以提高许多有机染料的荧光产量，这也可以延长染料的寿命。我们已经开发了波长可调的激光器，其中嵌入了DNA-鲸蜡基三甲基铵（DNA-CTMA）中的半菁染料。几种方法应用于染料掺杂，导致与DNA或其复合物的相互作用方式不同。尽管光学性质取决于反射制备方法的材料结构，但染料在各种情况下仍表现出良好的激光介质性能。因此，研究其相互作用机理及其对激光性能的影响非常重要。为了研究相互作用模式，使用了三种类型的染料，即4- [4-（二甲基氨基）苯乙烯基] -1-甲基碘化吡啶鎓（DMASMPI或对-Hemil），2- [4-（二甲基氨基）苯乙烯基] -1-甲基碘化碘（邻-Hemil）和2-（4-二甲基氨基苯乙烯基）-1-乙基喹啉碘化物（奎纳丁红）。与水中DNA相互作用的染料具有强烈的荧光增强作用和光谱移动，提示直接结合至DNA的重要性，而在乙醇中与DNA-CTMA相互作用时，染料显示出最强的荧光发射而没有明显的光谱移动。事实表明，荧光增强的多种起源可能适用于构建激光器。掺入染料的DNA-CTMA薄膜是用几种不同的方法制备的，目的是控制染料的相互作用方式。用“浸没法”掺杂p-Hemil的薄膜在光泵浦下产生了590-620nm范围内的光放大和激光振荡。在输出的受激发射减弱之前，这些薄膜运转了1个多小时，显示出染料在复合物中的强耐久性。

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