Even the most affordable red light therapy mask on this list, the Project E Beauty Photon Mask, will set you back $140. After ...

A recent review in Engineering explores multi-photon 3D nanoprinting. This technology, with its unique 3D processing and nanoscale resolution, has wide applications in fields like optics and biology.

Controlled generation of single-photon emitters in silicon (red) by broad-beam implantation of ions (blue) through a lithographically defined mask (left) and by a scanned focused ion beam (right).