Electromagnetic response and optical properties of anisotropic CuSbS2 nanoparticles

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. (C) 2022 Optica Publishing Group

Automated summary

We investigated the electromagnetic response of anisotropic copper antimony disulfide nanoparticles and layers embedded with them. We found that the response strongly depends on the anisotropy and orientation of the nanoparticles. The results demonstrate the potential applications of anisotropic dielectric particles in polarization-dependent-response devices such as solar devices and NIR sensors.