Enhanced and polarized emission from single colloidal CdSe/CdS nanocrystals coupled to a one-dimensional gold grating

Abstract

International audienceWe present in detail the fluorescence properties of single thick-shell CdSe/CdS colloidal nanocrystals coupled to a linear one-dimensional gold grating. In addition to the photoluminescence decay rate increase, we point out that the polarization ratio of the emission is dramatically enhanced. It overcomes 80% and can reach values close to unity. Experimental results are successfully compared to theoretical predictions. Blinking suppression is also reported

Efficient Emission Enhancement of Single CdSe/CdS/PMMA Quantum Dots through Controlled Near-Field Coupling to Plasmonic Bullseye Resonators

“…An alternative approach relies on a targeted manipulation of colloidal quantum emitters into a gap of an existing plasmonic antenna, or vice versa, by using a tip of an atomic force microscope (AFM). − While alleviating the exposure of a delicate quantum emitter to high-energy electrons or chemical etchants, the challenge of utilizing high field enhancements is in the precise positioning of the QD into a small volume of the plasmonic mode . This challenge is further amplified by the fact that the placement of a colloidal QD within few nanometers of a metal antenna can result in a detrimental quenching of the photoluminescence.…”