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2Physics Quote:
"Can photons in vacuum interact? The answer is not, since the vacuum is a linear medium where electromagnetic excitations and waves simply sum up, crossing themselves with no interaction. There exist a plenty of nonlinear media where the propagation features depend on the concentration of the waves or particles themselves. For example travelling photons in a nonlinear optical medium modify their structures during the propagation, attracting or repelling each other depending on the focusing or defocusing properties of the medium, and giving rise to self-sustained preserving profiles such as space and time solitons or rapidly rising fronts such as shock waves." -- Lorenzo Dominici, Mikhail Petrov, Michal Matuszewski, Dario Ballarini, Milena De Giorgi, David Colas, Emiliano Cancellieri, Blanca Silva Fernández, Alberto Bramati, Giuseppe Gigli, Alexei Kavokin, Fabrice Laussy, Daniele Sanvitto. (Read Full Article: "The Real-Space Collapse of a Two Dimensional Polariton Gas" )

Tuesday, May 10, 2005

Nanotechnology: "There's Plenty of Room at the Bottom"

In 1959, Richard Feynman gave his visionary talk entitled "There's Plenty
of Room at the Bottom" on the Caltech campus in Pasadena, CA. This great
presentation by Feynman now holds a preeminent, defining, and inspirational
place in the history of the now-emerging field of Nanotechnology. In what
were approximately 7000 words, he mapped out potentialities that are only
today beginning to be realized.

In January 2001, President Clinton visited the Caltech campus and, in a
preview of his upcoming State of the Union address, announced his
administration's launch of the "National Nanotechnology Initiative." This
impetus has since led to a huge upsurge of activity; a number of major
universities and research institutions have now embarked upon their own
"nano" initiatives in diverse areas of nanoscale science and technology
that covers important areas of biotechnology too.

Caltech launched the Kavli Nanoscience Institute (KNI) in order to enhance
its multidisciplinary research activities in all ares of nanoscience. To know
more about nanotechnology, visit KNI website. Yes, you will get a link to
many interesting and popular articles about this field, including that
celebrated article by Feynman also!


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