High-definition direct-print of metallic microdots with optical vortex induced forward transfer
Rong Wei, Haruki Kawaguchi, Kaito Sato, Sayaka Kai, Keisaku Yamane, Ryuji Morita, Ken‐ichi Yuyama, Satoyuki Kawano, Katsuhiko Miyamoto, Nobuyuki P. Aoki, Takashige Omatsu
Abstract
We demonstrate high-definition, direct-printing of micron-scale metallic dots, comprised of close-packed gold nanoparticles, by utilizing the optical vortex laser-induced forward transfer technique. We observe that the spin angular momentum of the optical vortex, associated with circular polarization, assists in the close-packing of the gold nanoparticles within the printed dots. The printed dots exhibit excellent electrical conductivity without any additional sintering processes. This technique of applying optical vortex laser-induced forward transfer to metallic dots is an innovative approach to metal printing, which does not require additional sintering. It also serves to highlight new insights into light–matter interactions.