Plasmonic field guided patterning of ordered colloidal nanostructures

• Published in: Nanophotonics (Berlin, Germany) Vol. 8; no. 3; pp. 505 - 512
• Main Authors: Huang, Xiaoping, Chen, Kai, Qi, Mingxi, Zhang, Peifeng, Li, Yu, Winnerl, Stephan, Schneider, Harald, Yang, Yuanjie, Zhang, Shuang
• Format: Journal Article
• Language: English
• Published: Berlin De Gruyter 26.03.2019; Walter de Gruyter GmbH
• Subjects: Colloids; Dipole interactions; Evanescent waves; Fluence; Induced polarization; Nanoparticles; ordered colloidal nanostructures; Patterning; plasmonic field guided patterning; polarization stabilizing; Raman spectroscopy; Self-assembly; Silver
• ISSN: 2192-8606; 2192-8614
• DOI: 10.1515/nanoph-2018-0211

Nano-patterned colloidal plasmonic metasurfaces are capable of manipulation of light at the subwavelength scale. However, achieving controllable lithography-free nano-patterning for colloidal metasurfaces still remains a major challenge, limiting their full potential in building advanced plasmonic devices. Here, we demonstrate plasmonic field guided patterning (PFGP) of ordered colloidal metallic nano-patterns using orthogonal laser standing evanescent wave (LSEW) fields. We achieved colloidal silver nano-patterns with a large area of 30 mm in <10 min by using orthogonal LSEW fields with a non-focused ultralow fluence irradiation of 0.25 W cm . The underlying mechanism of the formation of the nano-patterns is the light-induced polarization of the nanoparticles (NPs), which leads to a dipole-dipole interaction for stabilizing the nano-pattern formation, as confirmed by polarization-dependent surface-enhanced Raman spectroscopy. This optical field-directed self-assembly of NPs opens an avenue for designing and fabricating reconfigurable colloidal nano-patterned metasurfaces in large areas.