We demonstrate, for the first time, 2-dimensional (2D) direct print of perfect circle microdots consisting of close-packed Au nanoparticles by employing the optical vortex induced forward transfer (OV-LIFT). Going beyond the ink-jet printing technology, the OV-LIFT allows the direct print of ultrafine microdots with a diameter of ~8 μm and an ultralow positional error of <7 μm.
We demonstrate the direct print of micron-scale dots consisting of close-packed gold nanoparticles by employing the optical vortex laser-induced forward transfer technology. Moreover, SAM enhances the close-packing of gold nanoparticles in the printed dot.
We demonstrate the creation of a microdroplet with a plasmonic Au nanoparticle core by employing the optical vortex
laser-induced forward transfer technology. The single plasmonic nanoparticle in the microdroplet is printed as a plasmonic
nanocore on a receiver substrate with a spatial resolution beyond the diffraction limit. This phenomenon manifests that the
optical vortex traps three-dimensionally only a suspended single Au nanoparticle in its dark core by its repulsive force
owing to plasmonic resonance, and it has the potential to realize a myriad of plasmonic structured materials.
Plasmonic nanostructures enable us to enhance light fields at nanoscale beyond diffraction limit, thereby offering us metamaterials and plasmonic crystals to realize exotic light-matter interactions, including negative refractive index, invisible cloaking, and perfect absorption.
We here demonstrate, for the first time to be the best of our knowledge, the creation of a single water microdroplet with a single plasmonic Au nanoparticle (~150 nm) core (plasmonic nanocore) by employing the optical vortex induced forward transfer. The microdroplet can be easily trapped to form a single plasmonic nanocore on a receiver substrate with a spatial resolution beyond the diffraction limit. Going beyond conventional fabrication processes for plasmonic structures, such as lithography technologies based on electron and ion beams, such plasmonic nanocore formation in a water microdroplet should offer us new fabrication technology for plasmonic structures.
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