Layer-by-layer stereolithography (SL) of complex medium

A laser-based layer-by-layer stereolithography (SL) processing technique is utilized to realize finely periodic effective medium for the first time. By the local control of dielectric materials in a small electrical scale, an effective medium can be created to have a controllable dielectric constant and lower loss tangent than that of the constituent materials. Preliminary measurement results have proved this concept and validated the quasi-static approximation formulas used to characterize the materials. The excellent fabrication flexibility and tolerance of SL processing enable us to create unique microwave composite materials.