Laser-induced forward transfer of silver nanopaste for microwave interconnects

•High viscosity Ag nanopaste voxels were congruently laser printed.•Effect of laser fluence and donor-receiver gap on voxel transfer was studied.•Demonstrated voxel transfer with areas spanning 4 decades (25 to 250,000μm2).•Several methods of conjoining voxel chains were explored.•Low loss coplanar waveguides using Ag voxel chains up to 3mm long were fabricated. We explore the effect of variations in laser fluence and donor-receiver substrate distance on the laser-induced forward transfer technique for high viscosity Ag nanopaste. By transferring 50μm×50μm voxels with thicknesses between 0.8 and 8.7μm at different laser fluences, we are able to systematically determine a thickness-fluence regime for successful transfer that widens with increasing voxel thickness. We use these results to study congruent transfer of square voxels with lateral dimensions spanning 2 orders of magnitude: 5μm×5μm, 50μm×50μm, and 500μm×500μm. We conclude by linking a multitude of voxels together in 1mm and 3mm lines to fabricate the center conductor in coplanar waveguides (CPWs) with relatively low loss up to 10GHz.