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Published on: June 23, 2022
Investigation of Performance Parameters of Spherical Gold Nanoparticles in Localized Surface Plasmon Resonance
Vivek Semwal1, Oliver Rishøj Jensen2, Ole Bang1
1DTU Electro, Department of Electrical and Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
Abstract:
In this paper, we present numerical and experimental results on Localized Surface Plasmon Resonance (LSPR) refractive index (RI) sensitivity, Figure of Merit (FoM), and penetration depth (d) dependence on spherical gold nanoparticles (AuNPs) size, and the effects of AuNP dimer interparticle distance (d) studied numerically. These parameters were calculated and observed for d = 20, 40, 60, 80, and 100 nm diameter spherical AuNPs. Our investigation shows d = 60 nm AuNPs give the best FoM. The AuNP dimer interparticle distance can significantly influence the RI sensitivity. Therefore, the effect of distances between pairs of d = 20 nm and 60 nm AuNPs is shown. We discuss the importance of penetration depth information for AuNPs functionalized with aptamers for biosensing in the context of aptamer size.
