Sub-micron parallel laser direct-write

Toward 3D Printing of Pure Metals by Laser‐Induced Forward Transfer

“…The disk‐shaped drops that constitute the pillars may be beneficial for 3D manufacturing, but these are not generally obtained. In particular, for fluences just above the ejection threshold a sphere is deposited, as shown in Figure a and reported previously . For intermediate fluences, the drops solidify as a disk (Figure b,c), but toroids and fragmentation have also been observed (splashing, as shown in supplementary Figure 3, Supporting Information, is only scarcely observed; for a discussion see, e.g., ref.…”

“…By placing a receiver substrate in the drop's line of flight, deposition is achieved. Up to now, pure‐metal LIFT has enabled deposition of single drops, lines, and solid parts of the donor film …”

“…For these low Weber numbers, drops hardly spread during impact as shown in Figure e, and thus can only solidify in a spherical shape. Since fluences just above the ejection threshold also correspond to the smallest droplets, increasing the printing resolution (using smaller drops) and control of the drop shape are conflicting requirements.…”

Investigations on laser printing of microcapacitors using poly (methyl methacrylate) dielectric thin films for organic electronics applications

“…Furthermore, by downscaling such laser printing techniques, nanometer-size objects can be printed, e.g. by using an array of transparent microspheres (microlenses) [20,21]. We have previously investigated the laser fabrication of various organic electronic devices by using polymers such as polyvinylphenol (PVP) and parylene-C (Py-C) [16,[22][23][24].…”

Laser-induced forward transfer of pure metals

“…So far, application of pure-metal LIFT for 3D direct-write has been limited to the deposition of single metal droplets [18,42,49], conductive lines or tracks [10,19], and the deposition of nanoparticles [50]. This is because two challenging requirements have to be simultaneously fulfilled for consistent deposition: the impact location of a single droplet has to be limited to the previously deposited droplet's impact area, and good adhesion between the deposited droplets is required.…”