Can light itself cast a shadow? It may sound like a philosophical riddle, but researchers have found that under certain ...

Caltech's new optical devices, evolved by algorithms and crafted via precise 3D printing, offer advanced light-manipulation for applications like augmented reality and cameras. Researchers at Caltech ...

The technique works because the green laser (wavelength 532 nanometers) changes the way the crystal responds to some other ...

where a laser at one wavelength excites fluorescent tags bound to structures in a sample. Light emitted by the tags is collected, and a 3D image is built up from multiple scans of the sample at ...