Mechanically Driven,\nContinuous Synthesis of Chiroplasmonic\nAssemblies

Chiral plasmonic nanomaterialswith their significant\napplications\nin protein detection, drug screening, and enantioselective sensingnecessitate\nan industrialized fabrication procedure to enhance their commercial\nviability. However, the prevailing manufacturing of chiral plasmonic\nnanoparticles and assemblies heavily leans on manual intervention,\ncausing time-consuming and quality-inconsistent concerns. Here, we\ndevelop an automated, continuous mechanical synthesis system that\nconsistently sprays metal nanowires to create chiroplasmonic assemblies:\na macroscopic twisted layered structure comprising equivalent linear\nbirefringence layers, approximate linear polarizer layers, and a precise\nangular offset between them. Utilizing the synthesis-with-automation\nsystem, we scale up the production of chiral plasmonic films, generating\nhigh optical asymmetry (<i>g</i>-factor, with the order\nof 10<sup>–1</sup>) across a broadband ranging from ultraviolet\nto near-infrared wavelengths. We further introduce the portable chiral\nsensing, expanding plasmonic assemblies into flexible materials and\nintegrating them with wearable real-time display devices. Our mechanically\ndriven, continuous synthesis of chiral plasmonic structures presents\nan intriguing pathway to facilitate functional chiral structures toward\npractice.