1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China;2. ITMO University, St. Petersburg 197101, Russia;3. Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, USA
Abstract:
Asymmetric metal‐dielectric nanostructures are demonstrated superior optical properties arising from the combination of strong enhancement of near‐fields and controllable scattering characteristics which originate from plasmonic and high‐index dielectric components. Here, being inspired by the recent advances of the asymmetric hybrid nanoparticles fabrication [Dmitry Zuev, et al., Adv. Mater. 28 , 3087 (2016)], we suggest and study numerically a novel type of hybrid dimer nanoantennas. The nanoantennas consist of asymmetric metal‐dielectric (Au/Si) nanoparticles and allow tuning of the near‐ and far‐field properties via laser induced reshaping of the metal part at the nanoscale. We demonstrate an ability to modification of the scattering properties, near‐field distribution profilis, normalized local density of states, and radiation patterns of the nanoantenna upon the laser reshaping. The parameters used to investigate these effects correspond to experimentally demonstrated values.
