Modelling of nanosensors based on localised surface plasmon resonance

ABSTRACT

To design nanosensors based on localised surface plasmon (LSP), a structure is considered consisting of metal nanoparticles and study the influence of nanoparticles size, material, geometry, and background refractive index (RI) on its performance. We propose a nanosensor based on nanoplasmonic and investigate its sensitivity. The boundary element method is employed to calculate the extinction cross-section and sensitivity of the proposed sensor. We study the effect of various parameters on LSP resonance. Our calculations about extinction, scattering, and absorption spectra have been compared with experimental data. According to the comparison, it is deduced the boundary element method provides acceptable results. It is shown that the proposed nanosensor is very sensitive to the variation of sample RI. Moreover, it is possible to adjust the required spectral range by changing the geometry and material of nanoparticles. Here, the highest sensitivity is obtained for cubic nanoparticles made of silver.

KEYWORDS:

• Nanosensor
• boundary element method
• plasmonic

Data availability statement

The data that supports the findings of this study are available from the corresponding author upon reasonable request.

Disclosure statement

No potential conflict of interest was reported by the authors.