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Researchers at Aalto University Report Findings in Physics (Spatial coherence properties of organic molecules coupled to plasmonic surface lattice...

July 15, 2014



Researchers at Aalto University Report Findings in Physics (Spatial coherence properties of organic molecules coupled to plasmonic surface lattice resonances in the weak and strong coupling regimes)

By a News Reporter-Staff News Editor at Physics Week -- Investigators discuss new findings in Physics. According to news reporting originating in Aalto, Finland, by VerticalNews journalists, research stated, "We study spatial coherence properties of a system composed of periodic silver nanoparticle arrays covered with a fluorescent organic molecule (DiD) film. The evolution of spatial coherence of this composite structure from the weak to the strong coupling regime is investigated by systematically varying the coupling strength between the localized DiD excitons and the collective, delocalized modes of the nanoparticle array known as surface lattice resonances."

The news reporters obtained a quote from the research from Aalto University, "A gradual evolution of coherence from the weak to the strong coupling regime is observed, with the strong coupling features clearly visible in interference fringes. A high degree of spatial coherence is demonstrated in the strong coupling regime, even when the mode is very excitonlike (80%), in contrast to the purely localized nature of molecular excitons."

According to the news reporters, the research concluded: "We show that coherence appears in proportion to the weight of the plasmonic component of the mode throughout the weak-to-strong coupling crossover, providing evidence for the hybrid nature of the normal modes."

For more information on this research see: Spatial coherence properties of organic molecules coupled to plasmonic surface lattice resonances in the weak and strong coupling regimes. Physical Review Letters, 2014;112(15):153002. (American Physical Society - www.aps.org/; Physical Review Letters - prl.aps.org)

Our news correspondents report that additional information may be obtained by contacting L. Shi, COMP Centre of Excellence, Dept. of Applied Physics, Aalto University, FI-00076 Aalto, Finland. Additional authors for this research include T.K. Hakala, H.T. Rekola, J.P. Martikainen, R.J. Moerland and P. Torma.

Keywords for this news article include: Aalto, Europe, Finland, Physics.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Physics Week


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