  We introduce the concept of optical control of the fluorescence yield of CdSe
quantum dots through plasmon-induced structural changes in random
semicontinuous nanostructured gold films. We demonstrate that the wavelength-
and polarization dependent coupling between quantum dots and the semicontinuous
films, and thus the fluorescent emission spectrum, can be controlled and
significantly increased through the optical extinction of a selective band of
eigenmodes in the films. This optical method of effecting controlled changes in
the metal nanostructure allows for versatile functionality in a single sample
and opens a pathway to in situ control over the fluorescence spectrum.
