  It is shown that a pair of identical emitters (e.g. wire dipole antennas) in
the focal points of a disc, made of left-handed metamaterial (a "perfect"
lens), form a non-radiating electromagnetic configuration. The emitters are fed
with voltages of equal magnitude and pi-out-of-phase. Detailed
finite-difference time-domain (FDTD) modeling shows that there are
non-propagating electromagnetic fields generated - fields that remain confined
within the region between the emitters and the lens. The energy balance of the
system shows that the radiation resistance of the system is very low. This
means that the input power is converted to heat in the volume of the lens and
only a small fraction of it is radiated. The system performance shows that
disturbing the configuration of the non-propagating electromagnetic fields with
the presence of an externally introduced object stimulates radiation. This
suggests possible detector applications. In-phase feeding voltages are also
studied with the consequence that the radiation resistance of the antennae is
increased.
