Fig. 3From: Scalable Fabrication of Quasi-Three-Dimensional Chiral Plasmonic Oligomers Based on Stepwise Colloid Sphere Lithography TechnologySchematic diagram of the preparation process. a BK7 glass substrate. b Self-assembly of polystyrene microspheres. c Glancing angle deposition of metal vapor. d Removal of unwanted portions with PDMS. e Resulting structure and its top viewBack to article page