AAWSAP DIRD, Invisibility Cloaking Theory and Experiments, March 2010

Text

This text came with the file. It may have mistakes. When the text and the image disagree, the image is right.

UNCLASSIFIED/ fFOR: 8FFI@IAL Y!H! 9HL'f
B
I I
I
I
I
I
I
I I i
I
I I
_,__
,...
:-... I
,,.
......
I
I
I
.,
,
I i
I
1'\
I I
I
I
\
_""""T, ...._ ~--- '
_..____._
. .. '-"-
·•-~
I I I
'
I I
I .1
I I
I I
I
-
I
I
I
I
I
+-·-'-
\
I ·-
-
-1-
-r·-·-
--.-
-i- _ ,_ -~
i-
_ ,___
I
1./
-
·-t-
I
_,_,_
'
~
-
~roe: _
....
.!.,, ,.,.
I I
I I
I
'
I I
I I
I I
Figure 9. An Optical Material Deforms the Coordinates of Space. A: virtual space, B: real space.
The material acts like a transformation of space. In the device, each point in real space
is put to a new location in a virtual space (outside of the device, space remains the
same). The device creates the illusion that light propagates along straight lines through
the virtual space, whereas in reality it is bent. Suppose the device encloses a hollow
region that is not part of t he virtual space or, to be more precise, a region with a
surface that, in virtual space, has become a single point. The red circle in Figure 9B is
reduced to the red dot in Figure 9A. As the hollow region is not part of the virtual space
where light propagates, everything inside it has become invisible. As the coordinates of
virtual space smoothly go over into the coordinates of real space at the outer surface of
the device, light rays are not distorted. Any object inside the cloaking device is hidden,
and so is the act of hiding itself. Moreover, the cloaking device not only would bend
light rays but would modify the entire structure of light waves in such a way that
detecting the hidden object is impossible. Light waves would advance around the
hidden core of the device, engulfing it, as Figure 10 shows.8
UNCLASSIFIED//EOA: OEEICI0 .. Uili OPU:¥
8