Resonant Raman Scattering from Silicon Nanoparticles Enhanced by Magnetic Response

TL;DR

This paper demonstrates that magnetic dipole resonances in silicon nanoparticles significantly enhance Raman scattering, with experimental evidence showing a 140-fold increase at the magnetic resonance, highlighting the importance of magnetic responses in light-matter interactions.

Contribution

The study reveals that magnetic dipole modes in silicon nanoparticles have a stronger effect on Raman scattering than electric modes, with experimental validation of a 140-fold enhancement.

Findings

Magnetic dipole modes dominate Raman enhancement in silicon nanoparticles.

Experimental demonstration of 140-fold Raman signal increase.

Magnetic responses are crucial for enhancing light-matter interactions.

Abstract

Enhancement of optical response with high-index dielectric nanoparticles is attributed to the excitation of their Mie-type magnetic and electric resonances. Here we study Raman scattering from crystalline silicon nanoparticles and reveal that magnetic dipole modes have much stronger effect on the scattering than electric modes of the same order. We demonstrate experimentally a 140-fold enhancement of Raman signal from individual silicon spherical nanoparticles at the magnetic dipole resonance. Our results confirm the importance of the optically-induced magnetic response of subwavelength dielectric nanoparticles for enhancing light-matter interactions.