Probing spatial correlations in a system of polarizable nanoparticles via measuring its optical extinction spectrum
1 Centro de Matemática, Universidade do Minho, Campus de Gualtar - Braga 4710-057, Portugal, EU
2 Centro de Física, Universidade do Minho, Campus de Gualtar - Braga 4710-057, Portugal, EU
Received: 11 May 2013
Accepted: 10 June 2013
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, using the Tikhonov regularization method. This number has to be compared to pre-calculated values for a model NP system with given density and correlation parameters.
PACS: 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures / 81.07.-b – Nanoscale materials and structures: fabrication and characterization
© EPLA, 2013