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.
Bibliographical noteFunding Information:
We thank Avinoam Stern, Yefim Barash and Benny Levy from Accubeat Ltd. for the preparation of rubidium cells and the use of their vacuum facilities. L.S. acknowledges the CAMBR fellowship. We acknowledge financial support from the Israeli science foundation. The coated prisms were fabricated at the Centre for Nanoscience and anotechnology, The Hebrew University of Jerusalem.
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