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Surface enhanced Raman scattering (SERS) is a widely used method for detecting the presence of biomolecules at low concentrations. This technology increasingly uses porous silicon as a substrate, enabling the generation of 'hotspots' thanks to its rough surface, which are essential for reaching very low detection limits (pM - fM)[1]. However, the impact of the capture of plasmonic nanoparticles, such as Gold ones, in the pores is not yet fully understood. In this work, we used a multiphysics numerical tool (i.e. Comsol Multiphysics [2]) to investigate the properties of Gold nanoparticles embedded in porous Silicon. To reduce the complexity of the analysis, in a first instance we simulated the electromagnetic response of one Gold nanosphere within a single pore (cfr. Fig. 1). The electromagnetic field is exalted because of the effective refractive index of the medium surrounding the nanoparticle, which red-shifts the plasmonic resonance of the nanoparticle to become less affected by the optical absorption, i.e. Im(ε). Our results indicate that porous silicon is a good substrate for SERS, even when the plasmonic nanoparticles are captured in the pores. As a first result, the enhancement factor of a single gold nanoparticle inside a pore is of the same order of magnitude as a single sphere on a silicon substrate. The Electric field enhancement (EF) is 2.83 vs 2.07. This has been computed with the results shown in fig 1 and fig 2. This work aims thus to analyze the impact of the porous silicon on the increase of the electromagnetic field in the context of the SERS detection. References : [1] Khinevich, Nadzeya, et al. (2021). Porous silicon – A versatile platform for mass-production of ultrasensitive SERS-active substrate. Microporous and Mesoporous Materials, 323:111204. [2] COMSOL Multiphysics, www.comsol.com COMSOL AB, Stockhom, Sweden.
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Gevers, C., & Francis, L. (2023). Increase of the SERS signal from Gold Nanospheres in porous Silicon. 6th SCOPe National Conference, Louvain-la-Neuve, Belgium. https://hdl.handle.net/2078.5/269221