Observation of stimulated emission from Rhodamine 6G-polymer aggregate adsorbed at foam interfaces. [Dataset]
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PANCHOLI, K. 2018. Observation of stimulated emission from Rhodamine 6G-polymer aggregate adsorbed at foam interfaces. [Dataset]. Held on OpenAIR [online]. Available from: http://hdl.handle.net/10059/3227
This dataset was compiled in support of a project which observed stimulated emissions from the gas–liquid interface between two adjacent bubbles in highly ordered foams containing Rhodamine 6 Gand surfactant. The data is stored in the form of a tabular spreadsheet and also in the form of images. The spreadsheet is in ".xlsx" format and the images in ".tif" format. Stimulated emissions centred at 595 nm were observed when a monolayer of foam (∼liquid fraction 0.11), placed on a highly reflective surface, was subjected to 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. A high threshold stimulated emission centred at 595 nm wavelength was shown to occur at the interface between two neighbouring bubbles in Rhodamine 6G-doped foams excited with a 532 nm laser. The stimulated emission was highly dependent on the laser incidence angle, the gap between two adjacent bubbles rather than the diameter of the bubbles. Additionally, the liquid fraction of the foam is a key factor for channelling photons at the interfaces. An efficient reflection and the use of reflective surfaces as substrates are crucial for obtaining single model stimulated light amplification for high loss foam systems. This can, however, be useful for efficient light guiding. The foam can be used as a template for adsorbed nanoparticles and dyes to create a highly regular structure of nanoparticles at a low cost. A 2D structure with a regular array of hole can be stacked in z-direction to create a 3D structure capable of absorbing multiphoton for an increased catalytic reaction.