The material is very cool, but I'm almost more interested in the progress in 3D nanofabrication this shows - "printing" material in 3D by selective solidificati

The material is very cool, but I'm almost more interested in the progress in 3D nanofabrication this shows - "printing" material in 3D by selective solidification tends to be pretty slow, as you need to move around like a 3D printer head instead of one-shotting an entire layer like in 2D lithography. The fact that they have made a millimeter scale version of their design instead of a small demo that looks cool under an electron microscope is very impressive! The method is pretty clever too - 2 photon absorption works only where the light is focused (and therefore high intensity). They use a lens array to create 49 focus points, allowing them to parallelize the printing of the repeating grid! Scalable 3D fab could have fun implications for materials like this, and for chip-scale photonics.