Controlling electrons in graphene opens a new path to potential electronic devices
For the first time, scientists created a tunable artificial atom in graphene. They demonstrated that a vacancy in graphene can be charged in a controllable way such that electrons can be localized to mimic the electron orbitals of an artificial atom. Importantly, the trapping mechanism is reversible (turned on and off) and the energy levels can be tuned.
Better living through pressure—functional nanomaterials made easy
Using pressure instead of chemicals, a Sandia National Laboratories team has fabricated nanoparticles into nanowire-array structures similar to those that underlie the surfaces of touch-screens for sensors, computers, phones and TVs. The pressure-based fabrication process takes nanoseconds. Chemistry-based industrial techniques take hours.
Engineers invent method to control light propagation in waveguides
A team of Columbia Engineering researchers, led by Applied Physics Assistant Professor Nanfang Yu, has invented a method to control light propagating in confined pathways, or waveguides, with high efficiency by using nano-antennas. To demonstrate this technique, they built photonic integrated devices that not only had record-small footprints but were also able to maintain optimal performance over an unprecedented broad wavelength range.
Physicists image individual molecules by watching them absorb light
What do ships, bats and torpedoes have in common? They navigate by emitting sound waves and listening where those get absorbed or reflected. Humans do the same with light waves, except that they rely on external sources like the sun for the original emission. However when looking at something as small as a single molecule this becomes problematic, as light waves, not to mention sound waves, are bigger than the object itself.
Nano-sized sensors provide unprecedented data on how heat diffuses in and out of living cells
Tiny flat sensors that stick to the surface of living cells can provide detailed measurements of heat transfer at the cell surface. Developed at King Abdullah University of Science and Technology (KAUST), Saudi Arabia, these new sensors resolve some of the practical challenges of working with these tiny cells as well as enable novel diagnostic techniques.