Plasmonic Octagonal Quasi Crystals for Surface-Enhanced Raman Sensing

Surface-enhanced Raman scattering (SERS) on 8-fold quasi crystal arrays with precisely controlled size and spacing fabricated via electron beam lithography was investigated. This SERS substrate shows high efficiency at 785 nm excitation in the detection of p-mercaptoaniline (pMA), and a SERS enhancementfactor (EF) of 107 is achieved. SERS behavior of the realized engineered SERS substrateindicatesthat the present engineered metamaterial may be used as an ultrasensitive Raman probe and could open up interesting new opportunities in biosensing.