Size-selective optical printing of silicon nanoparticles through their dipolar magnetic resonance

ZAZA, CECILIA; VIOLI, IANINA LUCILA; GARGIULO, JULIAN; CHIARELLI, GERMÁN; LANGOLF, LUDMILLA; JAKOBI, JURIJ; OLMOS, JORGE; CORTES, EMILIANO; KOENIG, MATTHIAS; BARCIKOWSKI, STEPHAN; SCHLÜCKER, SEBASTIAN; SAENZ, JUAN JOSE; MAIER, STEFAN A.; STEFANI, FERNANDO D

ACS Photonics

American Chemical Society

Año: 2019 vol. 6 p. 815 - 822

2330-4022

Silicon nanoparticles possess unique size-dependent optical properties due to their strong electric and magnetic resonances in the visible range. These properties are of particular application relevance if lateral ordered patterns of Silicon nanoparticles with defined size are accessible. However, their widespread application has been limited, in comparison to other (e.g. metallic) nanoparticles, because their preparation on monodisperse colloids remains challenging. Here, we demonstrate that surfactant-free Silicon nanoparticles of a predefined and narrow ( < 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 on nanoparticles of different sizes by tuning the light wavelength to the size-dependent magnetic dipolar resonance of the nanoparticles.