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Orientation dependence of optical activity in light scattering by nanoparticle clusters

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posted on 2022-04-24, 05:35 authored by A Fazel-Najafabadi, Baptiste AuguiéBaptiste Auguié
The optical properties of nanoparticle clusters vary with the spatial arrangement of the constituent particles, but also the overall orientation of the cluster with respect to the incident light. This is particularly important in the context of nanoscale chirality and associated chiroptical responses, such as circular dichroism or differential scattering of circularly polarised light in the far-field, or local degree of optical chirality in the near-field. We explore the angular dependence of such quantities for a few archetypal geometries: a dimer of gold nanorods, a helix of gold nanospheres, and a linear chain of silicon particles. The examples serve to illustrate the possible variation of chiroptical responses with the direction of light incidence, but also, consequently, the importance of a robust orientation-averaging procedure when modelling general clusters of particles in random orientation. Our results are obtained with the rigorous superposition T-matrix method, which provides exact analytical formulas for fixed and orientation-averaged properties. This journal is

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Preferred citation

Fazel-Najafabadi, A. & Auguié, B. (2022). Orientation dependence of optical activity in light scattering by nanoparticle clusters. Materials Advances, 3(3), 1547-1555. https://doi.org/10.1039/d1ma00869b

Journal title

Materials Advances

Volume

3

Issue

3

Publication date

2022-02-07

Pagination

1547-1555

Publisher

Royal Society of Chemistry (RSC)

Publication status

Published

Online publication date

2022-01-01

ISSN

2633-5409

eISSN

2633-5409

Language

en

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