Chiral all-dielectric trimer nanoantenna Articles uri icon

authors

  • ULLAH, KALEEM
  • GARCIA CAMARA, BRAULIO
  • HABIB, MUHAMMAD
  • LIU, XUEFENG
  • KRASNOK, ALEX
  • LEPESHOV, SERGEY
  • HAO, JINGJING
  • LIU, JUAN
  • YADAV, N. P.

publication date

  • March 2018

start page

  • 71

end page

  • 77

volume

  • 208

international standard serial number (ISSN)

  • 0022-4073

electronic international standard serial number (EISSN)

  • 1879-1352

abstract

  • Chirality is a property of certain molecules, materials or artificial nanostructures, which enables them to interact with the spin angular momentum of an incident light. This provides a different optical response, depending on the incident polarization, which gives rise to chiral optical spectroscopies. However, low detection limits require an enhanced chiral light-matter interaction. Here, we propose a novel type of resonant chiral optical nanoantenna based on high-index dielectric (Cu2O) spherical nanoparticles arranged in a trimer geometry. We demonstrate both numerically and experimentally that this trimer nanoantenna exhibits resonantly enhanced optical dichroism and light hotspots, which are associated with this geometry. Moreover, we apply near-field optical microscopy to measure the near-field peculiarities of the proposed nanoantenna. The ability of changing the nanoantenna near field scattering by varying the light polarization is shown. (C) 2018 Elsevier Ltd. All rights reserved.