Optical response of Lorentzian nanospheres in the quasistatic limit

► Optical resonance of Lorentzian nanospheres (LNS) is examined for the first time. ► LNS are shown to be blue shifters of the nanoparticle (NP) resonance. ► This is opposite of the well-studied response of Drude NP (red-shifters). ► Nanoscale optical response of the two cases is compared in depth. ► The results are imperative for manipulating the optical response of exciton-plasmon hybrid NPs.