Why perovskite solar cells are so efficient

Solar cells with efficiencies above 20% and produced at low costs – perovskites make this possible. Now, researchers of Karlsruhe Institute of Technology (KIT) have gained fundamental insight into the function of perovskite ...

Breaking metamaterial symmetry with reflected light

Optical activity—rotation of the polarization of light—is well known to occur within materials that differ from their mirror image. But what happens if this symmetry is broken by the direction of illumination rather than ...

Researchers identify process for improving durability of glass

Researchers at the UCLA Henry Samueli School of Engineering and Applied Science and the Université Pierre et Marie Curie in Paris have identified a method for manufacturing longer-lasting and stronger forms of glass. The ...

Engineers use disorder to control light on a nanoscale

A breakthrough by a team of researchers from UCLA, Columbia University and other institutions could lead to the more precise transfer of information in computer chips, as well as new types of optical materials for light emission ...

Controlling light on a chip at the single-photon level

Integrating optics and electronics into systems such as fiber-optic data links has revolutionized how we transmit information. A second revolution awaits as researchers seek to develop chips in which individual atoms control ...

Supersonic laser-propelled rockets

Scientists and science fiction writers alike have dreamt of aircrafts that are propelled by beams of light rather than conventional fuels. Now, a new method for improving the thrust generated by such laser-propulsion systems ...

Device turns flat surface into spherical antenna

By depositing an array of tiny, metallic, U-shaped structures onto a dielectric material, a team of researchers in China has created a new artificial surface that can bend and focus electromagnetic waves the same way an antenna ...

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