Surface lattice resonance in an asymmetric air environment of 2D Au near-spherical nanoparticle arrays: impact of nanoparticle size and its sensitivity

2D Au nanoparticle (NP) arrays with larger NP size displayed an obvious surface lattice resonance (SLR) peak in an asymmetric air environment, indicating that, if the NP size was large enough, index-matching was not necessary for forming SLR.