So, a ball of heavy metal should bend all grazing neutrinos toward a single focal spot. (discovermagazine.com)
By reducing the cross-sectional area of the focal spot by about a factor of 18 below the diffraction limit (260 nanometers), STED allowed us to map and describe the vesicle mobility within the highly confined space of synaptic boutons. (science.sciencemag.org)
We present video - rate (28 frames per second) far - field optical imaging with a focal spot size of 62 nanometers in living cells. (science.sciencemag.org)