We demonstrate the laser-induced forward transfer of fluorescent liquid droplets with viscosity 100 times higher than that of water. The optical vortex allows the high-definition direct-print of uniform microdroplets with no satellite droplets at desired locations within 10% positioning error, while the Gaussian laser produces only irregular printed droplets with many undesired satellite droplets. The printed droplets act as a laser with whispering-galley-modes. We discuss the droplet formation mechanism from the viewpoint of laser-induced cavitation based on the observation with a high-speed camera.
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.
Laser-induced forward transfer, a nozzle-free direct printing technology, enables the direct print of various donor materials, such as solids, high viscosity liquids with functional nanoparticles at high density, and even biomaterials, on a receiver owing to laser induced evaporation pressure. An optical vortex with a helical wavefront exhibits a donut-shaped spatial profile and an orbital angular momentum, and it has been leading to new fundamental sciences and advanced technologies. In recent years, we and our co-workers have proposed a new direct printing technology based on optical vortex, here referred as optical vortex laser induced forward transfer, in which a single optical vortex pulse twists the irradiated donor to eject and propel a pico-liter scale spinning microdroplet, thereby enabling well-aligned microdots with high spatial resolution on a receiver substrate. Going beyond conventional LIFT technologies, we here demonstrate the direct 2D print of well-aligned metallic microdots with a diameter of 15~45 µm, consisting of close-packed gold nanoparticles at high density, by the optical vortex laser induced forward transfer with the aid of a spin angular momentum associated with circular polarization. The electrical resistance of printed dot was measured to be ~10-7 Ωm, corresponding to 5-6 times higher than that of bulk gold. Optical vortex laser-induced forward transfer will pave the way towards next-generation printed electronics.
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