When asked as "wind power generator", many people remind me of windmill wing type rotors with huge feathers as large as several tens of meters in diameter, and indeed many windmills are used in ...

The PBG group of Department of physics, Fudan University, recently proposed a method using a reflective photonic crystal slab to generate vortex with high conversion efficiency and without an ...

Researchers have developed a 3D-printed device that generates twisting light beams with orbital angular momentum (OAM), a form of rotational energy that can carry more data than regular beams.