A laser beam is shone onto a variable rectangular aperture. The size of the hole determines the type of diffraction produces on the screen. Very small apertures produce Fraunhofer diffraction, and ...

You can’t put a square peg in a round hole. But putting a square aperture on a round telescope might be the best way to see the light of distant, Earth-like planets. At least, that’s what computer ...

The collective response of charged particles to intense fields is intrinsic to plasma accelerators and radiation sources, relativistic optics and many astrophysical phenomena. Here we show that a ...