November 12, 2012 23:34
A team of researchers at Northwestern University (Northwestern University) developed a method of making single copies tiny nanolasers a size of a few nanometers, and which operate at room temperature. These plasmonic nanolasers without difficulty can be integrated into the silicon semiconductor photovoltaic devices, optical devices and nanoscale sensors. Reducing the size of photonic and electronic devices is very important for the implementation of ultra-fast processing and high density data storage, and a major step in this direction is the miniaturization of the key element of the light source of the laser.
"Creating a source of coherent light nanometer is important not only for studies of the phenomena occurring at the micro-and nanoscale. Through these sources, we will be able to create optical devices and devices with dimensions smaller than the diffraction limit is determined by the "- says Teri Odom (Teri Odom), a scientist at Northwestern University and an expert on nanotechnology.
"The fact that has allowed us to create a nanolaser with dimensions smaller than the diffraction limit determined, was a special three-dimensional shape of the optical resonator cavity emitting coherent light. This form is very similar to the three-dimensional version of the bow tie "- says Odom.
Metal base, which created the deepening of the optical resonator is the generator of the surface plasmon field consisting of synchronous oscillations of free electrons in the metal. Plasmons are a phenomenon of the quantum world, so for them there are no fundamental limitations associated with the diffraction of light.
The form of the "butterfly" has two important advantages over forms created in previous attempts to create plasmonic nanolasers. First, due to the antenna effect it provides the appearance of a clear nanovolumes electromagnetic "hot" points of light emitted. And second, because of its discrete geometry nanolaser has very low energy losses.
In addition to all the above benefits of the new nanolasers in the course of experiments, scientists, is located on a single chip nanolasers matrix, found another amazing fact. It turns out these nanolasers can emit light at certain angles, which depend on the orientation of the crystal lattice of the material base.