Laser Transfer: Laser Transfer of Metals and Metal Alloys for Digital Microfabrication of 3D Objects (Small 33/2015)

3D laser printing in ambient conditions is demonstrated by M. Zenou and co-workers on page 4082. The fabrication of the 3D structure consists of overlapped copper droplets a few tens of femtoliters each. The fast solidification of the molten metal droplet as it lands reduces its spreading, allowing the fabrication of high aspect-ratio structures. The letters shown in the image are 50 μm wide and are gradually of a higher height from 40 μm (‘s’) to 190 μm (‘l’). The image was taken with tilt of 55 degrees.