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From: NewsToBeRead on 3 May 2010 03:51
http://www.physorg.com/news187274527.html

How to see through opaque materials

Knowing enough about the way light is scattered through materials would
allow physicists to see through opaque substances, such as the sugar cube on
the right. In addition, physicists could use information characterizing an
opaque material to put it to work as a high quality optical component,
comparable to the glass lens show on the left. Credit: American Physical
Society

New experiments show that it's possible to focus light through opaque
materials and detect objects hidden behind them, provided you know enough
about the material.

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Materials such as paper, paint, and biological tissue are opaque because the
light that passes through them is scattered in complicated and seemingly
random ways.

A new experiment conducted by researchers at the City of Paris Industrial
Physics and Chemistry Higher Educational Institution (ESPCI) has shown that
it's possible to focus light through opaque materials and detect objects
hidden behind them, provided you know enough about the material. The
experiment is reported in the current issue of Physical Review Letters, and
is the subject of Viewpoint in APS Physics by Elbert van Putten and Allard
Moskof the University of Twente.

In order to demonstrate their approach to characterize opaque substances,
the researchers first passed light through a layer of zinc oxide, which is a
common component of white paints. By studying the way the light beam changed
as it encountered the material, they were able to produce a numerical model
called a transmission matrix, which included over 65,000 numbers describing
the way that the zinc oxide layer affected light. They could then use the
matrix to tailor a beam of light specifically to pass through the layer and
focus on the other side. Alternatively, they could measure light emerging
from the opaque material, and use the matrix to assemble of an image of an
object behind it.

In effect, the experiment shows that an opaque material could serve as a
high quality optical element comparable to a conventional lens, once a
sufficiently detailed transmission matrix is constructed. In addition to
allowing us to peer through paper or paint, and into cells, the technique
opens up the possibility that opaque materials might be good optical
elements in nano-scale devices, at levels where the construction of
transparent lenses and other components is particularly challenging.


More information: Measuring the Transmission Matrix in Optics: An Approach
to the Study and Control of Light Propagation in Disordered Media, S. M.
Popoff, G. Lerosey, R. Carminati, M. Fink, A. C. Boccara, and S. Gigan,
Phys. Rev. Lett. 104, 100601 (2010) - Published March 08, 2010, Download PDF
(free)


Provided by American Physical Society


From: Benj on 3 May 2010 14:36
On May 3, 3:51 am, "NewsToBeRead" <NewsToBeR...(a)USA.Com> wrote:

> http://www.physorg.com/news187274527.html
> How to see through opaque materials
>
> Knowing enough about the way light is scattered through materials would
> allow physicists to see through opaque substances, such as the sugar cube on
> the right. In addition, physicists could use information characterizing an
> opaque material to put it to work as a high quality optical component,
> comparable to the glass lens show on the left. Credit: American Physical
> Society
>
> New experiments show that it's possible to focus light through opaque
> materials and detect objects hidden behind them, provided you know enough
> about the material.

Allow me to suggest that the "professional writers" at the "leading"
physics news service would cease to do their "bit" in helping to dumb-
down the world if they spent a few dollars on a dictionary. Words
actually have meanings, you know.

"Opaque" actually means that radiation can't go through the substance.
Hence "seeing through opaque materials" is nonsense and ignorant in
the extreme. It's no wonder that "journalists" are ranked below used
car salesmen by the public when it comes to respect. Idiots.

(Hey Wormley! Did you secretly post this? This has all the earmarks of
your kind of post.)



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