Off-Resonance Enhancement of the Refractive Index via Indirect Optical Transitions.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41171640.
- Also identified by DOI 10.1021/acs.nanolett.5c04414.
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Abstract
At resonance, the optical response of a homogeneous medium to incident light is governed by temporal dispersion, which induces changes in the refractive index (RI). However, recent experimental results reveal RI enhancements exceeding the fundamental limit of 5 in spatially confined systems. Herein, we study the off-resonance enhancement of RI in sub-5 nm gold nanoparticles using electronic light scattering (ELS). We discuss that the RI driven by the distribution and dynamics of excited-state charge carriers can be locally boosted through the breaking of spatial symmetry in matter. These findings are critical for optically probing RI variations in spatially confined media using ELS.