Approach for fine-tuning of hybrid dimer antennas via laser melting at the nanoscale

作者：Sun, Yali; Kolodny, Stanislav; Lepeshov, Sergey; Zuev, Dmitry; Huang, Lirong; Belov, Pavel; Krasnok, Alexander^*

来源：Annalen der Physik, 2017, 529(3): 1600272.

DOI：10.1002/andp.201600272

• nanoantennas
• nanoparticles
• optical magnetic response
• laser melting
• Au/Si
• plasmonics

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.

• 出版日期2017-3
• 单位华中科技大学