  We investigate the fluorescence properties of colloidal quantum dots attached
to gold rod nanoantennas. These structures are fabricated by a two step
electron beam lithography process in combination with a chemical linking
method. By varying the nanoantenna length, the plasmon modes of the
nanoantennas are successively tuned through the emission band of the quantum
dots. We observe a pronounced fluorescence enhancement both for short and long
nanoantennas. These findings can be attributed to the coupling of the quantum
dots to bright and dark plasmon modes, respectively.
