New found that graphene can DianZhuan into the light

Graphene is made of the carbon atoms in only one atom thick layer of two-dimensional crystal, is a kind of ultra-thin super nanometer materials, and has high strength, good electric properties and optical properties, known as the "king of the new material" of the 21st century. Therefore, its inventor Andre geim and konstantin carbon won the 2010 Nobel Prize in physics together. Due to the special properties of graphene, the new energy The battery, display, sensor, semiconductor, etc in the field of applied research has made great progress. And in the field of laser, also can see the figure of graphene, the related research is in full swing.

Graphene films can increase the high power laser heat transfer components

As the equipment and components are getting smaller and smaller, the development of super efficient electronic system in the future, electronic and optical electronic heat dissipation is a serious problem. Now, Sweden, he university of science and technology researchers developed a highly efficient cooling by functionalized graphene nano flake electronics technology, may pave the way for solving this problem. Related research results published in the latest issue of the journal nature communications.

In the experiments, scientists studied nanotechnology was fixed in graphene sheet layer interface and the boundary of covalent bond is formed on a large number of molecules, they also through the use of the sunlight reflection measurement technology, demonstrate the functional improvement of thermal coupling phenomenon, to show that the interface thermal resistance. Results show that based on different functional amino and optimization based on azide silane molecule film of heat conduction, thermal conversion rate is 76% greater than untreated system, it mainly through the introduction of functional molecules and make the contact resistance decreased dramatically.

Molecular dynamics simulations and calculations show that after the layer of faculties, hampered the low-frequency phonon scattering in cross section, but the reverse bending phonon life by restoring the long, thus enhances the combination with the vertical section of heat conduction. Results show that the electronic equipment provides a potential thermal management solutions.

Engaged in the production of electronic products research at the university of John professor liu said: "the film based on graphene nano flake, can make the electronic and other electrical equipment, efficient heat transfer this may be an effective solution, the related research results are more and more close to the pilot production stage. The future the graphene membrane can be integrated into the microelectronic devices and systems, used for cooling efficiency light-emitting diodes (leds), laser, and rf components, this will be developed faster and more small, high efficiency and energy saving of high power electronic products to pave the way."

[new] graphene can DianZhuan into the light

Researchers at the Massachusetts institute of technology (MIT) and other international institutions have found a similar aircraft more than the speed of sound produced when the process of the sonic boom: that is to say, the charge through the graphene, in some cases, more than slows down the speed of light, can form a kind of light "explosive" - a strong focused beam.

The new converts electrical energy into visible radiation is highly controlled, and quickly and efficiently., researchers say, is that this approach could lead to a variety of new applications. Research published in the international academic journal journal of Nature Communications.

The new study comes from an interesting observation. The researchers found that when the light to the graphene sheet, its speed can be greatly reduced. And this kind of dramatic slowing, brought an interesting coincidence. Slow down because of the path of the same material of a photon (particle of light) through graphene speed very close to the speed of the electron.

The researchers said: "the graphene can pass the way we called the surface plasmon capture the light. Plasma is a kind of represents the surface electron oscillation of the virtual particles. The plasma through the graphene hundreds slower than the speed of light in free space."

This result is consistent with the characteristics of graphene another: electronic through graphene at very high speed, up to one million meters per second, or one over three hundred of the speed of light in a vacuum. This means that the two kinds of speed close enough, if the material can be tuned in order to get the matching speed, then will be significant interaction between two particles.

This combination features - slows down the speed of light and allow quick in electronic is one of the properties of graphene unusual. This feature also provides a possibility graphene have the opposite effect: form rather than capture the light.

Work, the researchers said this theory suggests that can arise through this kind of method to form a new way of light.

In particular, because the electron velocity in graphene can close to the speed of light, to break the light barrier ", so this kind of transformation is feasible.

So far, the work is still in the theoretical stage. The researchers of the next step will be to build the system of the practical work of version so that to validate the concept.

Using terahertz graphene preparation "diode" breakthrough

Precision instruments and optoelectronic engineering college under the Tianjin university, professor wei-li zhang terahertz research center team in graphene THZ wave has made breakthrough progress in the study of modulation, the research is published in the international famous academic journals Nature Communications 2 (2015)[6708].This paper entitled "Active graphene – silicon hybrid diodefor terahertz waves" reported on the use of photoelectric parallel mechanism of graphene - silicon composite structure of active modulation of the original work.

As a typical two-dimensional materials, graphene has single atomic structure, excellent optical, electrical, and mechanical properties, showed many attractive, novel physical properties. Because of the conductivity of the external regulation and tunable band gap width, graphene has many potential applications in the field of terahertz. Among them, the use of graphene for active control of THZ wave is one of the hot research topic at present. On the international at present, however, are usually USES a single type of light stimulated or by means of THZ wave electric modulation implementation regulation, the modulation depth is limited by the obvious.

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