The phase and the group velocity of light propagating in conventional optical media cannot exceed the speed of light in ...

Electric sparks are used for welding, powering electronics, killing germs or for igniting the fuel in some car engines. Despite their usefulness, they are hard to control in open space, they split ...

Researchers at the Ernst Strüngmann Institute in Frankfurt am Main, Germany, led by Wolf Singer, have made a new discovery in ...

Optical rectennas enhance solar energy conversion, utilizing advanced diodes for efficient energy harvesting, crucial for the ...