Customized mix of materials for three-dimensional micro- and nanostructures

Three-dimensional structures on the micrometer and nanometer scales have a great potential for many applications. An efficient and precise process to print such structures from different materials has now been presented: researchers have integrated a microfluidic chamber into a 3D laser lithography device. Then, they used this system to produce multi-colored, fluorescent security features to protect banknotes, documents, and branded products against counterfeiting.