Campuses:

Cloaking and opaque perfect lenses

Monday, October 2, 2006 - 11:00am - 11:50am
EE/CS 3-180
Graeme Milton (The University of Utah)
We show how a slightly lossy superlens of thickness d cloaks
collections of polarizable line dipoles or point dipoles or finite
energy dipole sources that lie
within a distance of d/2 of the lens. In the limit as the loss
in the lens tends to zero, these become essentially invisible
from the outside through the cancelling effects of localized resonances
generated by the interaction of the source and the superlens. The
lossless perfect Veselago lens has
attracted a lot of debate. It is shown that as time
progresses the lens becomes increasingly opaque
to any physical dipole source located within a distance d/2 from
the lens and which has been turned on at time t=0. Here a physical
source is defined as one which supplies a
bounded amount of energy per unit time. In fact the lens cloaks the source
so that it is not visible from behind the lens either. For sources which
are turned on exponentially slowly there is an exact correspondence
between the response of the perfect lens in the long time constant limit
and the response of lossy lenses in the low loss limit. This is joint
work with Nicolae Nicorovici and Ross McPhedran.
MSC Code: 
78A25