Refractive surgery, a subfield of ophthalmology, is defined as the surgical correction of refractive errors of the human eye. It has become a highly specialized area in the last few years. Ophthalmic ...

Scientists have demonstrated that negative refraction can be achieved using atomic arrays -- without the need for artificially manufactured metamaterials. Scientists have long sought to control light ...

Gaussian-shaped laser-beam frequency spectrum can now be translated into a collimated flat-top beam that propagates with little change in power and intensity or loss of uniformity over large distances ...