Spectral tunability of a plasmonic antenna with a dielectric nanocrystal
  We show that the positioning of a nanometer length scale dielectric object, such as a diamond nanocrystal, in the vicinity of a gold bowtie nanoantenna can be used to tune the plasmonic mode spectrum on the order of a linewidth. We further show that the intrinsic luminescence of gold enhanced in the presence of nanometer-scale roughness couples efficiently to the plasmon mode and carries the same polarization anisotropy. Our findings have direct implications for cavity quantum electrodynamics related applications of hybrid antenna-emitter complexes. 
Yury Alaverdyan, Nick Vamivakas, Joshua Barnes, Claire Lebouteiller,   Jack Hare, Mete Atat\"ure
cond-mat.mes-hall physics.optics