Optical Printing of Single Au Nanostars

Nano Lett. 2023 Apr 12;23(7):2703-2709. doi: 10.1021/acs.nanolett.2c05109. Epub 2023 Mar 23.

Abstract

Obtaining arrays of single nanoparticles with three-dimensional complex shapes is still an open challenge. Current nanolithography methods do not allow for the preparation of nanoparticles with complex features like nanostars. In this work, we investigate the optical printing of gold nanostars of different sizes as a function of laser wavelength and power. We found that tuning the laser to the main resonances of the nanostars in the near-infrared makes it possible to avoid nanoparticles reshaping due to plasmonic heating, enabling their deposition at the single particle level and in ordered arrays.

Keywords: colloidal particles; lasers; optical forces; optical lithography; plasmonic heating; single nanocrystals.