Optimal geometry parameter for plasmonic sensitivities of individual Au nanopoarticle sensors

摘要: The shape, aspect ratio and size are key parameters governing the plasmon sensitivities of individual Au nanoparticle bio/chemical sensors. It is crucial to unveil general geometry optimize their corresponding sensitivity applications. In this work, geometry-dependent refractive-index factor (S) figure merit (FOM) sensors (including a nanodisc, nanorod, nanoellipsoid hexagonal nanoplate) numerically investigated by discrete dipole approximation (DDA). S revealed increase quadratically/linearly with ratio, while FOM reaches maximum at an optimized about 3.0/8.0 for studied prolate/oblate nanoparticles, respectively, reflecting shapes ratios and, hence, effects. However, responses shape factors shown follow nearly same trend regardless different detailed geometries, demonstrating that provide concerned This can be analytically explained well under dipolar localized surface resonance (LSPR) conditions. Their optimal predicted 12.5 RIU−1 10.5; underlying reason discussed as well. obtained results in work believed hold great promise choosing appropriate LSPR-based sensor design applications access simultaneously.