Photo: U. Montan
Charles Kuen Kao
|
Photo: U. Montan
Willard S. Boyle
|
Photo: U. Montan
George E. Smith
|
The Nobel Prize in Physics 2009 was divided, one half awarded to
Charles Kuen Kao "for
groundbreaking achievements concerning the transmission of light
in fibers for optical communication", the other half jointly
to Willard S. Boyle and George E. Smith "for
the invention of an imaging semiconductor circuit - the CCD
sensor".
The Royal Swedish Academy of Sciences has
decided to award the Nobel Prize in Physics for 2009 with one
half to
Charles K. Kao
Standard Telecommunication Laboratories, Harlow, UK, and Chinese
University of Hong Kong
"for groundbreaking achievements concerning the transmission of
light in fibers for optical communication"
and the other half jointly to
Willard S. Boyle and George E. Smith
Bell Laboratories, Murray Hill, NJ, USA
"for the invention of an imaging semiconductor circuit – the CCD
sensor"
The masters of light
This year's Nobel Prize in Physics is awarded for two scientific
achievements that have helped to shape the foundations of
today’s networked societies. They have created many practical
innovations for everyday life and provided new tools for
scientific exploration. In 1966, Charles
K. Kao made
a discovery that led to a breakthrough in fiber optics. He
carefully calculated how to transmit light over long distances
via optical glass fibers. With a fiber of purest glass it would
be possible to transmit light signals over 100 kilometers,
compared to only 20 meters for the fibers available in the
1960s. Kao's enthusiasm inspired other researchers to share his
vision of the future potential of fiber optics. The first
ultrapure fiber was successfully fabricated just four years
later, in 1970.
Today optical fibers make up the circulatory system that
nourishes our communication society. These low-loss glass fibers
facilitate global broadband communication such as the Internet.
Light flows in thin threads of glass, and it carries almost all
of the telephony and data traffic in each and every direction.
Text, music, images and video can be transferred around the
globe in a split second.
If we were to unravel all of the glass fibers that wind around
the globe, we would get a single thread over one billion
kilometers long – which is enough to encircle the globe more
than 25 000 times – and is increasing by thousands of kilometers
every hour.
A large share of the traffic is made up of digital images, which
constitute the second part of the award. In 1969 Willard
S. Boyle and George
E. Smithinvented the first successful imaging
technology using a digital sensor, a CCD (Charge-Coupled
Device). The CCD technology makes use of the photoelectric
effect, as theorized by Albert
Einstein and for
which he was awarded the 1921 year's Nobel Prize. By this
effect, light is transformed into electric signals. The
challenge when designing an image sensor was to gather and read
out the signals in a large number of image points, pixels, in a
short time.
The CCD is the digital camera's electronic eye. It
revolutionized photography, as light could now be captured
electronically instead of on film. The digital form facilitates
the processing and distribution of these images. CCD technology
is also used in many medical applications, e.g. imaging the
inside of the human body, both for diagnostics and for
microsurgery.
Digital photography has become an irreplaceable tool in many
fields of research. The CCD has provided new possibilities to
visualize the previously unseen. It has given us crystal clear
images of distant places in our universe as well as the depths
of the oceans.
Charles Kuen Kao, British and US citizen. Born 1933 in
Shanghai, China. Ph.D. in Electrical Engineering 1965 from
University of London, UK. Director of Engineering at Standard
Telecommunication Laboratories, Harlow, UK. Vice-chancellor,
Chinese University of Hong Kong. Retired 1996.
www.ieeeghn.org/wiki/index.php/Oral-History:Charles_Kao
Willard Sterling Boyle, Canadian and US citizen. Born
1924 in Amherst, NS, Canada. Ph.D. in Physics 1950 from McGill
University, QC, Canada. Executive Director of Communication
Sciences Division, Bell Laboratories, Murray Hill, NJ, USA.
Retired 1979.
www.science.ca/scientists/scientistprofile.php?pID=129
George Elwood Smith, US citizen. Born 1930 in White
Plains, NY, USA. Ph.D. in Physics 1959 from University of
Chicago, IL, USA. Head of VLSI Device Department, Bell
Laboratories, Murray Hill, NJ, USA. Retired 1986.
www.ieeeghn.org/wiki/index.php/Oral-History:George_E_Smith
Prize amount: SEK
10 million. Kao is awarded one half, Boyle and Smith share the
other half.
Contact persons: Erik
Huss, Press Officer, Phone +46 8 673 95 44, mobile +46 70 673 96
50, erik.huss@kva.se
Annika Moberg, Editor, Phone +46 8 673 95 22, Mobile +46 70
263 74 46,annika.moberg@kva.se
The Royal Swedish Academy of Sciences, founded in 1739, is an
independent organization whose overall objective is to promote
the sciences and strengthen their influence in society. The
Academy takes special responsibility for the natural sciences
and mathematics, but endeavours to promote the exchange of ideas
between various disciplines.
The masters of light
Information rushes through highways of glass at the speed of
light. Pictures become digital inside the camera. The 2009 Nobel
Prize is awarded for two scientific achievements that have
helped to shape the foundations of today's networked societies.
They have created many practical innovations for everyday life
and provided new tools for scientific exploration.
Half of the prize is awarded to Charles Kao who made a discovery
that led to a breakthrough for fibre-optic communication. Today
optical fibres make up the circulatory system that nourishes our
information society. Light flows in threads of glass, as thin as
a hair, which carries almost all of the telephony and data
traffic in each and every direction. Without optical fibres
there would be no internet nor broadband. A large share of the
traffic is made up of digital images, which constitute the
second part of the award. In 1969 Willard S. Boyle and George E.
Smith invented the first successful imaging technology using a
digital sensor, a CCD (Charge-Coupled Device). The CCD
revolutionized photography, as light could now be captured
electronically instead of on film.
The image sensor, CCD, is the advanced digital camera's
electronic eye. Incoming light releases electrons in the CCD's
photocells, the pixels. The more light, the more electrons are
collected in
The CCD array is read out row by row. Electrons slide off the
array onto an electronic conveyor belt and are subsequently
translated into digital ones and zeros. This digital form makes
it easy to manipulate and transfer the images.
Every pixel is a
silicon mini-capacitor built in layers that collects the
electrons. A variable electric voltage is used for reading out
the pixels. In this simple but ingenious way, almost the entire
area of the sensor is used to collect light, creating the high
performance of the CCD.
Original notes. During
a short brainstorm meeting on September 8, 1969 (according to
the notes), Willard Boyle and George Smith made the first sketch
of a CCD. Photography was not what they had in mind, but very
soon CCD became the first truly successful technology for the
digital recording of images.
|
Compared to radio waves, light carries tens of
thousands times more information because of its much
higher frequencies. But ways to transmit light
signals over longer distances were still not known
in the first half of the 1960's. After just 20
metres, only 1 percent of the light that had entered
a glass fibre remained. Reducing this loss of light
became a challenge for a visionary like Charles Kao. |
Early on, astronomers realized
the advantages of the digital image sensor. It spans the entire
light spectrum, from X-ray to infrared. It is a much more
sensitive than photographic film: out of 100 incoming light
particles, CCD catches up to 90, whereas photographic film will
only catch one.
Left: the world's
largest digital camera ever, built at the University of Hawaii.
Its 40 square centimetres surface contains 64 x 64 CCDs, 1.4
billion pixels in total. Astronomers hope that telescopes
equipped with such cameras will find 5,000 new supernovas as
well as detect asteroids in potentially threatening trajectories
towards Earth.
Right: spiral
galaxy M51 in the constellation Canes Venatici is one of the
first images taken with this digital camera.
Medicine. CCD
technology is used in a host of medical applications, e.g.
imaging the inside of the human body, both for surgical
operations and for diagnostics such as endoscopy.
Left: endoscopy
capsule carrying a digital camera and a radio transmitter. Once
swallowed by the patient, the capsule wanders along the
digestion system and sends images like this from a 21 year old
woman with cancer of the small intestine, right.
Source:
http://www.nobelprize.org/nobel_prizes/physics/laureates/2009/
1 2 3 4 5 6 7 8 9 10 Newest
articles
|