Spectroscopic studies of plasmonic interactions in colloidal dimers fabricated by convective-capillary force assembly

Convective-capillary force assembly (CFA) [1] and the capillary separation effect [2] are combined in order to fabricate Au colloidal dimers with modulated edge-to-edge inter-particle spacings. A study of the assembly process demonstrates the effect of temperature and air-suction flow rate on contact-line speed and receding contact-angle. Finally, the dark-field spectroscopy of the polarized light scattered by the dimers shows evidence of plasmonic coupling.