Accurate determination of refractive index is fundamental to optical metrology, underpinning applications from precision length measurement to material characterisation and environmental sensing.

If you studied advanced physics at high school, there's a good chance that you remember Snell's law, which states how a ray of light bends when it crosses a boundary between two media. According to ...

In this way, and almost by chance, researchers at TU Wien developed a novel microscopy technique that allows the refractive index of biological samples to be measured at a resolution far below what ...