Abstract We report a novel glycan array architecture that binds the mannose‐specific binding protein, concanavalin A (ConA), with sub‐femtomolar avidity. new radical photopolymerization developed specifically for this application combines grafted‐from thiol–(meth)acrylate polymerization thiol–ene chemistry to graft glycans growing polymer brushes. The propagation of brushes was studied by carry...