  Cold spots are sub-wavelength regions which might emerge near a plasmonic
nanoantenna, should one or more components of some far-field illumination
cancel out with scattered light. With a simplest-case demonstration using two
dipolar scatterers, we show that by changing only the polarisation and
amplitude of two plane waves, a unique, zero-magnitude and super sub-wavelength
cold spot can be created anywhere in the space around a nanoantenna. This
technique is a means for ultra-fast, remote, and non-mechanical sub-wavelength
electric field manipulation.
