Recently, silicon nanoparticles have raised interest in the plasmonics community they present size-dependent electric and magnetic resonances in the visible range. However, their widespread application has been limited (in comparison to metallic nanoparticles, for example) because their preparation on monodisperse colloids remains challenging.
In our recent paper in ACS Photonics, we show that surfactant-free silicon nanoparticles of a predefined and narrow (σ < 10 nm) size range can be selectively immobilized on a substrate by optical printing from a polydisperse colloidal suspension. The size selectivity is based on differential optical forces that can be applied to the nanoparticles of different sizes by tuning the light wavelength to the size-dependent magnetic dipolar resonance of the nanoparticles.
This work is part of our collaboration with the groups of Prof. Stefan Maier and Prof. Juajo Sáenz.
ACS Photonics 6 (2019) 815-822
“Size-Selective Optical Printing of Silicon Nanoparticles through Their Dipolar Magnetic Resonance”
Cecilia Zaza, Ianina L. Violi, Julián Gargiulo, Germán Chiarelli, Ludmilla Schumacher, Jurij Jakobi, Jorge Olmos-Trigo, Emiliano Cortes, Matthias König, Stephan Barcikowski, Sebastian Schlücker, Juan José Sáenz, Stefan A. Maier, and Fernando D. Stefani
