Crafting Tiny Twisting Lights with a Micro‑Fluid Tool

A new technique lets scientists make tiny glowing balls that twist light in a precise way. The trick uses a micro‑fluidic device, a chip with tiny channels that squeeze liquid droplets into perfect spheres. Inside these spheres is a special polymer that can spin in a helical shape, giving the light a circular twist. By changing how fast liquid flows through the chip and how much polymer is in the solution, researchers can pick exactly how big each sphere will be—from about 5 to 13 microns. They even built two‑layer spheres where one layer is inside another, creating new shapes that still glow evenly and keep their twisting light. The final product shows a strong “handedness” of light, measured by a dissymmetry factor that can reach 0. 025, which is good for many future technologies.The method offers a simple, repeatable way to produce uniform, twisting‑light spheres that could be useful in displays, sensors or medical imaging. It also shows how careful control of flow and chemistry in a micro‑fluidic system can turn complex materials into useful tools.