Category Physics

Inkjet printed “lasing capsules” serve as the core of an organic laser. Figure (a) shows a schematic of the laser setup, while figure (b) shows actual lasing capsules, which would cost only a few cents to produce. OC stands for “Output Coupler” and FP stands for Febry-Perot etalon. Credit: Sanaur, et al/JAP

Ultra-low-cost, easy to fabricate ‘lasing capsules’ with an inkjet printer. Since lasers were invented more than 50 years ago, they have transformed a diverse swath of technology – from CD players to surgical instruments. Now researchers from France and Hungary have invented a way to print lasers that’s so cheap, easy and efficient they believe the core of the laser could be disposed of after each use.

“The low-cost and easiness of laser chip fabrication are the most significant aspects...

This graphic illustrates an engineered nitrogen vacancy in aluminum nitride. Credit: H.Seo, M.Govoni and G.Galli, University of Chicago

The leading method for qubit creation involves exploiting the structural defects in diamonds. But researchers found that the same defect could be engineered in cheaper aluminum nitride. If confirmed by experiments, this could significantly reduce the cost of manufacturing quantum technologies. Using supercomputers at NERSC at Berkeley Lab, these researchers have identified a possible candidate in aluminum nitride...

The illustration depicts the characteristic spin orientation (arrows) of electrons in a topological insulator (below). Using an initial circular polarised laser pulse, the spins are excited and point up or down. This can be proven by a second linearly polarised laser pulse (above). Credit: HZB

Scientists have shown how spin-polarized currents can be initiated in a controlled manner within samples of topological insulator material. In addition, they were able to manipulate the orientation of the spins of these currents. They thereby demonstrated that this class of materials is suitable for data processing based on spin.

Future information technologies should employ considerably less energy for processing data via topological insulators (with electrons at the surface being extremely mobile, ...

Functionalization mediates heat transport of graphene nanoflakes. Credit: Photo source: Johan Liu, credit: Philip Krantz, Krantz Nanoart

Heat dissipation in electronics and optoelectronics is a severe bottleneck in the further development of systems in these fields. To come to grips with this serious issue, researchers at Chalmers University of Technology have developed an efficient way of cooling electronics by using functionalized graphene nanoflakes.

“Essentially, we have found a golden key with which to achieve efficient heat transport in electronics and other power devices by using graphene nanoflake-based film. This can open up potential uses of this kind of film in broad areas, and we are getting closer to pilot-scale production based on this discovery,” says Johan Liu, Professor.

T...