Finite element method based investigation of substrates effect on surface-enhanced Raman spectroscopy

A. Adiraju, A. Al-Hamry, O. Kanoun

Abstract

Surface-enhanced Raman spectroscopy (SERS) is a widely used method for the detection of molecules of environmental concern such as pesticides. One of the key factors to achieve high sensitivity in SERS is the high electromagnetic enhancement formed between plasmonic nanoparticles which is dependent on the wavelength used, shape, size, distance, and type of nanoparticles. In this regard, the scope of this paper is to investigate the enhancement factor achieved between adjacent silver or gold nanoparticles of different geometrical configurations by changing the shapes and sizes of the particles. Simulations based on finite element methods (FEM) were carried out to investigate the effect of different excitation laser wavelengths. The obtained results show the dependency of the enhancement factor, size, type of nanoparticles, excitation wavelength of the laser, dielectric properties of the surrounding medium and the type of substrate used.

Keywords

SERS; FEM; plasmonics; metals; COMSOL

Download

IMEKO-TC19-2022-12.pdf

DOI

10.21014/tc19-2022.12

IMEKO TC

TC19 - Environmental Measurements

Back to the proceedings