Science > Physics > reducing the group velocity of light by a factor of more than 100
| Topic: |
Science > Physics |
| User: |
"Sam Wormley" |
| Date: |
15 Mar 2005 09:06:07 PM |
| Object: |
reducing the group velocity of light by a factor of more than 100 |
Photonic crystal slows down light (Mar 15)
http://physicsweb.org/article/news/9/3/10
Researchers in the US have succeeded in reducing the group velocity of
light by a factor of more than 100 in a novel two-dimensional photonic
crystal. Halice Altug and Jelena Vuckovic of Stanford University say the
device could be used for a variety of optical applications and
components, including high-power photonic crystal lasers with low
thresholds (Appl. Phys. Lett. 86 111102).
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| User: "Fred Chen" |
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| Title: Re: reducing the group velocity of light by a factor of more than 100 |
16 Mar 2005 02:00:46 AM |
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The December 11 2003 issue of Nature (p. 638) describes the actual
effective 'stopping" of a light pulse in an atomic medium. Maybe
something similar can be done here with more practical materials?
Fred
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| User: "Sam Wormley" |
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| Title: Re: reducing the group velocity of light by a factor of more than100 |
16 Mar 2005 08:02:45 AM |
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Fred Chen wrote:
The December 11 2003 issue of Nature (p. 638) describes the actual
effective 'stopping" of a light pulse in an atomic medium. Maybe
something similar can be done here with more practical materials?
Fred
"As the signal tries to propagate through these layers, the photons
bounce backwards and forwards between them. As a result, the pulse
makes no forward progress - the light is "frozen" in place. The pulse
is set free when the control beams are turned off."
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| User: "Jan Panteltje" |
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| Title: Re: reducing the group velocity of light by a factor of more than 100 |
16 Mar 2005 06:52:03 AM |
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On a sunny day (16 Mar 2005 00:00:46 -0800) it happened "Fred Chen"
<flipsu5@comcast.net> wrote in
<1110960046.400321.304910@z14g2000cwz.googlegroups.com>:
The December 11 2003 issue of Nature (p. 638) describes the actual
effective 'stopping" of a light pulse in an atomic medium. Maybe
something similar can be done here with more practical materials?
Fred
I can stop a light pulse with my hand.
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| User: "G=EMC^2 Glazier" |
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| Title: Re: reducing the group velocity of light by a factor of more than100 |
16 Mar 2005 07:37:46 AM |
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In a Lab.in Cambridge Ma light has been slowed to 3 mph It begs the
question,are photons slowed or are they going a longer distance. I'm
going with longer distance. bert
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