Thursday, April 18, 2013

Graphene nanostructures- a promised plasmonic platform for mid-infrared region

The investigation of the pathways by which plasmon, a quanta of collective oscillations of electrons, loses energy is very important for plasmonic science and technology. Graphene plasmonic structures in this direction are very helpful. Researchers have used CVD graphene nanostructures to understand the damping of plasmons in graphene and observed that substrate plays a vital role in significant plasmon dispersion and damping.

Tuesday, April 16, 2013

Loudspeakers made out of graphene

Chemical vapor deposited graphene has been used to make an audio device where graphene coated PVDF film can emit sound waves in a range of frequencies with high sound pressure level and low harmonic distortion. This demonstrates that graphene has uses which one has to think. The results are published in Applied Physics Letters:

Tuesday, April 2, 2013

A graphene based hot electron transistor

In a recent study published in Nano Letters, experimentalists have demonstrated DC functionality of graphene based hot electron transistor. Moreover, the device is integrated using fabrication steps which are compatible with Si technology. An on/off ratio exceeding 10E4 is reported for graphene based transistor.
The findings open doors for graphene device market.

Hot carrier generation in graphene !

In a recent study, researchers have analyzed different pathways contributing to the ultrafast relaxation of photoexcited carriers in graphene using tetra-hertz pump spectroscopy. The results indicate that carrier-carrier scattering is the dominant mechanism leading to the generation of hot electrons in graphene. These hot carriers in turn can drive current in graphene enabling its high efficiency optoelectronic applications.

Electron optics applications of graphene

Transverse magnetic focusing has been observed in graphene and is expected to open new application area of graphene in electron-optics. In a recent report published in Nature Physics, researchers have used ambipolar nature and ballistic transport properties of graphene to study the transverse magnetic focusing effect upto room temperature.