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Electromagnetic response and optical properties of anisotropic CuSbS2 nanoparticles

journal contribution
posted on 21.09.2022, 14:56 authored by Fahime Seyedheydari, Kevin Conley, Pasi Ylä-Oijala, Ari Sihvola, Tapio Ala-NissilaTapio Ala-Nissila

We investigate the electromagnetic response of anisotropic (non-spherical) copper antimony disulfide (CuSbS2) nanoparticles and layers embedded with them using computational methods. To this end, we calculate the scattering and absorption efficiencies of oblate spheroidal CuSbS2 nanoparticles using the surface integral equation method. We find strong dependence of the response depending on the anisotropy of the spheroids and their orientation with respect to the electric field polarization of incoming radiation. Thin spheroids display a sharp plasmonic resonance in the ultraviolet, which is observed only for the electric field polarization along the short axis. Fano resonances that appear in the near infrared (NIR) blueshift when the short axis length is reduced, and they can be either strongly suppressed or enhanced depending on the relative orientation of the spheroid. We further investigate the optical response of thin layers containing CuSbS2 spheroids at a low volume fraction using a Monte Carlo method. We find that the response of these layers can be considerably modified by changing the short axis length and the orientation of particles within the layer with respect to polarization. Our results demonstrate the potential of anisotropic dielectric particles for polarization-dependent-response applications such as solar devices and NIR sensors.

Funding

The Academy of Finland project 314488

QTF Centre of Excellence program (project 312298)

History

School

  • Science

Department

  • Mathematical Sciences

Published in

Journal of the Optical Society of America B

Volume

39

Issue

7

Pages

1743-1751

Publisher

Optica Publishing Group

Version

AM (Accepted Manuscript)

Rights holder

© Optica Publishing Group

Publisher statement

© 2022 Optica Publishing Group. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

Acceptance date

11/05/2022

Publication date

2022-06-10

Copyright date

2022

ISSN

0740-3224

eISSN

1520-8540

Language

en

Depositor

Prof Tapio Ala-Nissila. Deposit date: 21 September 2022