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Observation of stimulated emission from Rhodamine 6G-polymer aggregate adsorbed at foam interfaces.

Pancholi, Ketan; Robertson, Peter K.J.; Okpozo, Paul; Beattie, Neil S.; Huo, Dehong


Peter K.J. Robertson

Paul Okpozo

Neil S. Beattie

Dehong Huo


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.


PANCHOLI, K., ROBERTSON, P.K.J., OKPOZO, P., BEATTIE, N.S. and HUO, D. 2019. Observation of stimulated emission from Rhodamine 6G-polymer aggregate adsorbed at foam interfaces. Journal of physics: energy [online], 1(1), article ID 015007. Available from:

Journal Article Type Article
Acceptance Date Oct 29, 2018
Online Publication Date Dec 11, 2018
Publication Date Jan 31, 2019
Deposit Date Jan 4, 2019
Publicly Available Date Jan 4, 2019
Journal Journal of physics: energy
Print ISSN 2515-7655
Electronic ISSN 2515-7655
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 1
Issue 1
Article Number 15007
Keywords Reaction; Reactor; Lasing; Dye; Stimulated emission; Microbubbles; Photocatalysis; Foam
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