The "plasmonic laser" developed by Xiang Zhang's group at the University of California, Berkeley, uses an optical laser to create surface plasmons in a specially designed nanowire – containing cadmium-sulphide strands just 50 to 100 nm thick.
The wire rests on a sheet of metallic silver covered by a film of insulating material. The surface plasmons are created on the silver surface, with the wire acting to contain these plasmons and amplify them before they release their light.
The researchers were able to generate laser light at 489 nm, and they succeeded in focusing it onto a zone just 5 nanometres wide.
Separately, a group led by Mikhail Noginov of Norfolk State University in Virginia, created a device called a "spaser", which amplifies surface plasmons in a similar manner to a laser's amplification of light.DO YOU remember as a child producing paper cubes by folding up a flat cross shape? Now two researchers have applied the same technique to the nanoscale, in the process creating the first nanoparticles with precisely patterned surfaces. These patterns could form the basis of electronic nano-circuits or provide docking stations on targeted drug-delivery particles.
"At the macroscale, everything can easily be patterned in three dimensions," lead researcher David Gracias at Johns Hopkins University (JHU) in Baltimore, Maryland, told New Scientist. "However, nanoparticles with precisely patterned 3D surfaces simply do not exist."
The problem is that existing methods for patterning at the nanoscale only etch onto flat, two-dimensional surfaces. However, Gracias and his colleague Jeong-Hyun Cho realised that they could make a patterned 3D structure provided they could find a way to assemble it from a 2D one.
Using a narrow beam of electrons, Gracias and Cho carved into a sili
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The wire rests on a sheet of metallic silver covered by a film of insulating material. The surface plasmons are created on the silver surface, with the wire acting to contain these plasmons and amplify them before they release their light.
The researchers were able to generate laser light at 489 nm, and they succeeded in focusing it onto a zone just 5 nanometres wide.
Separately, a group led by Mikhail Noginov of Norfolk State University in Virginia, created a device called a "spaser", which amplifies surface plasmons in a similar manner to a laser's amplification of light.DO YOU remember as a child producing paper cubes by folding up a flat cross shape? Now two researchers have applied the same technique to the nanoscale, in the process creating the first nanoparticles with precisely patterned surfaces. These patterns could form the basis of electronic nano-circuits or provide docking stations on targeted drug-delivery particles.
"At the macroscale, everything can easily be patterned in three dimensions," lead researcher David Gracias at Johns Hopkins University (JHU) in Baltimore, Maryland, told New Scientist. "However, nanoparticles with precisely patterned 3D surfaces simply do not exist."
The problem is that existing methods for patterning at the nanoscale only etch onto flat, two-dimensional surfaces. However, Gracias and his colleague Jeong-Hyun Cho realised that they could make a patterned 3D structure provided they could find a way to assemble it from a 2D one.
Using a narrow beam of electrons, Gracias and Cho carved into a sili
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Am vazut multe ceasuri superbe pe www.topceas.ro Am vazut multe ceasuri superbe pe www.topceas.ro Am vazut multe ceasuri superbe pe www.topceas.ro BitDefender Problem BitDefender 2010 Problem BitDefender 2010
