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New Research Could Mean
Cellphones That Can See Through
Walls.
ScienceDaily (Apr. 18, 2012) — Comic
book hero superpowers may be one
step closer to reality after the latest
technological feats made by
researchers at UT Dallas. They have
designed an imager chip that could
turn mobile phones into devices that
can see through walls, wood, plastics,
paper and other objects.
The team's research linked two
scientific advances. One involves
tapping into an unused range in the
electromagnetic spectrum. The other
is a new microchip technology.
The electromagnetic spectrum
characterizes wavelengths of energy.
For example, radio waves for AM and
FM signals, or microwaves used for
cell phones or the infrared wavelength
that makes night vision devices
possible.
But the terahertz band of the
electromagnetic spectrum, one of the
wavelength ranges that falls between
microwave and infrared, has not been
accessible for most consumer devices.
"We've created approaches that open
a previously untapped portion of the
electromagnetic spectrum for
consumer use and life-saving medical
applications," said Dr. Kenneth O,
professor of electrical engineering at
UT Dallas and director of the Texas
Analog Center of Excellence(TxACE).
"The terahertz range is full of
unlimited potential that could benefit
us all."
Tapping the Terahertz Gap
Shown is the electromagnet
spectrum, from radio waves used for
FM and AM signals, to infrared waves
used for remote controls, to gamma
rays that kill cancer cells. A team at UT
Dallas is focusing on the "terahertz
band," which has not been accessible
for most consumer devices.
Using the new approach, images can
be created with signals operating in
the terahertz (THz) range without
having to use several lenses inside a
device. This could reduce overall size
and cost.
The second advance that makes the
findings applicable for consumer
devices is the technology used to
create the microchip. Chips
manufactured using CMOS
(Complementary Metal-Oxide
Semiconductor) technology form the
basis of many consumer electronic
devices used in daily life such as
personal computers, smart phones,
high definition TV and game consoles.
"CMOS is affordable and can be used
to make lots of chips," Dr. O said.
"The combination of CMOS and
terahertz means you could put this
chip and receiver on the back of a
cellphone, turning it into a device
carried in your pocket that can see
through objects." Due to privacy
concerns, Dr. O and his team are
focused on uses in the distance range
of less than four inches.
Consumer applications of such
technology could range from finding
studs in walls to authentication of
important documents. Businesses
could use it to detect counterfeit
money. Manufacturing companies
could apply it to process control.
There are also more communication
channels available in terahertz than
the range currently used for wireless
communication, so information could
be more rapidly shared at this
frequency.
Terahertz can also be used for
imaging to detect cancer tumors,
diagnosing disease through breath
analysis, and monitoring air toxicity.
"There are all kinds of things you
could be able to do that we just
haven't yet thought about," said Dr. O,
holder of the Texas Instruments
Distinguished Chair.
The research was presented at the
most recent International Solid-State
Circuits Conference (ISSCC). The team
will work next to build an entire
working imaging system based on the
CMOS terahertz system.
Other authors of the paper include
Ruonan Han and Yaming Zhang,
former students of Professor O,
Yongwan Kim and Dae Yeon Kim,
TxACE members, and Hisashi Sam
Shichijio, research professor at TxACE.
The work was supported by the
Center for Circuit & System Solutions
(C2S2 Center) and conducted in the
TxACE laboratory at UT Dallas, which
is funded by the Semiconductor
Research Corporation (SRC), the state
through its Texas Emerging
Technology Fund, Texas Instruments
Inc., The UT System and UT Dallas.
http://bit.ly/JaScF1