Scientists have created a new class of laser beam that appears to violate long-held laws of light physics. These new beams, which the team calls “spacetime wave packets,” follow different rules of ...

A team of scientists led by Academician Professor Xiang Zhang, President and Vice-Chancellor of The University of Hong Kong (HKU) and Chair of Engineering and Physics, has made a major breakthrough by ...

When light passes through materials, it typically changes direction and bends in predictable ways. This change in direction, ...

For the first time, scientists have demonstrated that negative refraction can be achieved using atomic arrays - without the need for artificially manufactured metamaterials. Scientists have long ...

Researchers at the University of Hong Kong demonstrate negative light refraction with the natural magnetic material CrSBr – an alternative to metamaterials. Normally, when a light beam enters water or ...