[tt] advanced nanotechnology - 2 new articles
Eugen Leitl
<eugen at leitl.org> on
Sat Nov 17 08:25:53 UTC 2007
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Date: Sat, 17 Nov 2007 03:22:48 -0500
To: eugen <eugen at leitl.org>
Subject: advanced nanotechnology - 2 new articles
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"[2]advanced nanotechnology" - 2 new articles
1. [3]New method to mnipulate light a million times more efficiently
2. [4]Nantero's newest NRAM promise is for 2008
3. [5]More Recent Articles
4. [6]Search advanced nanotechnology
[7]New method to mnipulate light a million times more efficiently
[8]Using a special hollow-core photonic crystal fibre, a team at the
University of Bath, UK, has opened the door to what could prove to be
a new sub-branch of photonics, the science of light guidance and
trapping.
The team, led by Dr Fetah Benabid, reports on the discovery, which
relates to the emerging [9]attotechnology, the ability to send out
pulses of light that last only an attosecond, a billion billionth
of a second.
It is 1000 times shorter than a femtosecond. [10]Short pulse lasers
are a very interesting and emerging tool for science and technology
They can destroy viruses and bacteria. [11]They can vaporize matter
without heat and be used for precise micromachining
These pulses are so brief that they allow researchers to more
accurately measure the movement of sub-atomic particles such as the
electron, the tiny negatively-charged entity which moves outside
the nucleus of an atom. Attosecond technology may throw light,
literally, upon the strange quantum world where such particles have
no definite position,only probable locations.
To make attosecond pulses, researchers create a broad spectrum of
light from visible wavelengths to x-rays through an inert gas. This
normally requires a gigawatt of power, which puts the technique
beyond any commercial or industrial use.
Dr Benabid's team used a photonic crystal fibre (pcf), the width of
a human hair, which traps light and the gas together in an
efficient way. Until now the spectrum produced by photonic crystal
fibre has been too narrow for use in attosecond technology, but the
team have now produced a broad spectrum, using what is called a
Kagomé lattice, using about a millionth of the power used by
non-pcf methods.
Tthe team makes use of the fact that light can exist in different
`modes' without strongly interacting. This creates a situation
whereby light can be trapped inside the fibre core without the need
of photonic bandgap. Physicists call these modes bound states
within a continuum.
[12][advancednano?i=QBF8SjB] [13][advancednano?i=mu7JWGB]
[14][advancednano?i=WRuCFkb] [15][advancednano?i=idURzLb]
[16][advancednano?i=geiGD4b] [17][advancednano?i=fQAFLlB]
[18][advancednano?i=Bf0dYFb] [19][advancednano?i=p3nl3pB]
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efficiently'
[25]Nantero's newest NRAM promise is for 2008
[26]Nantero is promising that NRAM could appear in consumer goods in
2008 However, they have previously promised 2005 and 2007.
The thought of introducing filthy carbon nanotubes into an
ultra-sensitive fab has blocked the rise of so-called NRAM or Nano
Random Access Memory. Thanks, however, to a refined cleansing
process and relentless browbeating start-up Nantero thinks it has
mainstream semiconductor players close to giving NRAM a try.
Nantero has attracted the attention of some big name tech players,
including HP, LSI and ON Semiconductor. These companies are either
experimenting with NRAM in their R&D labs or actually trying to
produce NRAM chips.
The Feds have a lot of interest in NRAM because of its longevity
and density. Flash, while glorious, does degrade over time as
insulators wear down due to charge fluctuations. Memory loss on a
satellite or weapons system can be a real pain.
So I think NRAM will have a radiation hardened and endurance niche.
[27][advancednano?i=o7kEAvB] [28][advancednano?i=D0fubsB]
[29][advancednano?i=iuqHdcb] [30][advancednano?i=1trpj1b]
[31][advancednano?i=XUA6OQb] [32][advancednano?i=FX1PvfB]
[33][advancednano?i=sApg4nb] [34][advancednano?i=b9wKW3B]
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[39]Rate 'Nantero's newest NRAM promise is for 2008'
More Recent Articles
* [40]Silicon electronics can be printed by Ink Jet printers
* [41]US 9th Appeals Court tosses federal fuel-economy standards
* [42]Nantero NRAM still not commercialized
* [43]Making cheaper, stronger and better carbon nanotubes without
metal catalysts
* [44]Carnival of Space week 29
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Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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