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Nano Lett. 2013 Mar 13;13(3):1285-90. doi: 10.1021/nl400046z. Epub 2013 Feb 11.

Maximal Raman optical activity in hybrid single molecule-plasmonic nanostructures with multiple dipolar resonances.

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Department of Chemical Physics, Weizmann Institute of Science, Rehovot 71600, Israel.


We show that a hybrid system built of a plasmonic nanoparticle cluster and a single molecule can attain maximal Raman optical activity (ROA), converting linearly polarized light into purely circularly polarized light at the Raman-scattered frequency. In contrast to standard molecular ROA, the effect described here does not involve magnetic modes and is attributed to off-resonance excitation of electric-dipole plasmon modes of the nanoparticle cluster. A model based on a combination of harmonic oscillators excited at the frequency of the Raman-scattered light is shown to successfully capture the physics of the effect.


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