We present a plasmonic whispering gallery nanoantenna doped with an ATTO680 dye that shows cavity-modified spontaneous emission. The plasmonic ring antenna consists of a circular groove cavity in a single-crystal Au surface that sustains resonances with different azimuthal and radial mode order. We observe spectral reshaping of the dye emission that can be tuned over a broad band by varying the cavity resonance conditions.

Appl. Phys. Lett.
Photonic Materials

Vesseur, E. J. R., & Polman, A. (2011). Controlled spontaneous emission in plasmonic whispering gallery antennas. Appl. Phys. Lett., 99(Article number: 231112), 1–3. doi:10.1063/1.3665622