Observation of stimulated emission from Rhodamine 6G-polymer aggregate adsorbed at foam interfaces
Observation of stimulated emission from Rhodamine 6G-polymer aggregate adsorbed at foam interfaces
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DOI：
10.1088/2515-7655/aaec3d
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
K. Pancholi;Peter K. J. Robertson;Paul Okpozo;N. Beattie;D. Huo
中科院分区：
文献类型：
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作者：
K. Pancholi;Peter K. J. Robertson;Paul Okpozo;N. Beattie;D. Huo
本文首次报道了在含有罗丹明6 G和表面活性剂的高度有序泡沫中，两个相邻气泡之间的气液界面上的受激辐射的观测结果。当放置在高反射表面上的单层泡沫（泡沫液体分数0.11）用532 nm连续波激光器泵浦时，观察到中心在595 nm处的受激发射，所述连续波激光器从垂直于基底的方向沿沿着约45°定向。此外，使用共聚焦显微镜和显微光致发光，它被发现，泡沫的液体分数，两个相邻的气泡之间的差距和激光的入射角是重要的参数，在引导光，促进受激发射在界面处。聚合物和染料的吸附增加了气泡对之间最靠近的间隙处的局部浓度，导致半球形胶束-染料附聚物的形成。胶束聚集体的存在引起了随机散射诱导的受激发射。这些结果可能会对许多应用产生重大影响，例如气泡界面处的光催化转化，其中TiO 2可以散射光，因此反应速率可能会增加。
This paper reports for the first time the observation of stimulated emissions from the gas–liquid interface between two adjacent bubbles in highly ordered foams containing Rhodamine 6 G and surfactant. Stimulated emissions centred at 595 nm were observed when a monolayer of foam (∼liquid fraction 0.11), placed on a highly reflective surface, was pumped with a 532 nm continuous wave laser directed along ∼45° from the direction perpendicular to the substrate. Additionally, using confocal microscopy and micro-photoluminescence, it was found that the liquid fraction of the foam, the gap between two adjacent bubbles and the incidence angle of the laser are important parameters in guiding the light and promoting stimulated emissions at the interface. The adsorption of the polymer and dye increased the local concentration at the narrowest gaps between pairs of bubbles, which led to the formation of hemispherical micelles-dye agglomerates. The presence of the micelles aggregation caused random scattering induced stimulated emission. These results could have a significant impact on a number of applications, such as photocatalytic conversion at bubble interfaces, where TiO2 can scatter light and hence reaction rates may be increased.