Fano resonances and all-optical switching in a resonantly coupled plasmonic–atomic system

Liron Stern, Meir Grajower and Uriel Levy ()
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Liron Stern: The Benin School of Engineering and Computer Science, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem
Meir Grajower: The Benin School of Engineering and Computer Science, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem
Uriel Levy: The Benin School of Engineering and Computer Science, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract The possibility of combining atomic and plasmonic resonances opens new avenues for tailoring the spectral properties of materials. Following the rapid progress in the field of plasmonics, it is now possible to confine light to unprecedented nanometre dimensions, enhancing light–matter interactions at the nanoscale. However, the resonant coupling between the relatively broad plasmonic resonance and the ultra-narrow fundamental atomic line remains challenging. Here we demonstrate a resonantly coupled plasmonic–atomic platform consisting of a surface plasmon resonance and rubidium (85Rb) atomic vapour. Taking advantage of the Fano interplay between the atomic and plasmonic resonances, we are able to control the lineshape and the dispersion of this hybrid system. Furthermore, by exploiting the plasmonic enhancement of light–matter interactions, we demonstrate all-optical control of the Fano resonance by introducing an additional pump beam.

Date: 2014
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DOI: 10.1038/ncomms5865

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