Probing spatial correlations in a system of polarizable particles via measuring its optical extinction spectrum

TL;DR

This paper demonstrates that spatial correlations in systems of polarizable particles, such as metallic nanoparticles, can be quantitatively inferred from optical extinction spectra through a numerical analysis of the surface plasmon resonance region.

Contribution

It introduces a method to extract short-range spatial correlation information directly from optical spectra using a derivative analysis of the ensemble response function.

Findings

Spatial correlations can be evaluated from extinction spectra.

The method applies to metallic nanoparticles in the surface plasmon resonance region.

A single numerical value effectively captures the correlation degree.

Abstract

It is shown that quantitative information on spatial correlations in a system of polarizable particles can be extracted directly from its experimentally measurable optical spectra. For a collection of metallic nanoparticles (NPs), it is demonstrated that the degree of short-range correlation in NP's positions can be evaluated by an appropriate numerical analysis of the extinction spectrum in the surface plasmon resonance region, given the polarizability of an individual NP. The spectrum analysis consists in the evaluation of a single number, which is the derivative of the ensemble response function in the vanishing polarizability limit, to be compared to pre-calculated values for a model NP system with given density and correlation parameters.