Abstract
The coupling between thick-shell CdSe/CdS colloidal nanocrystals with the hot spots of a semicontinuous gold film is characterized by measuring simultaneously the photoluminescence decay rate and the linear polarization ratio. The absence of correlations between the two quantities is demonstrated. In contrast with the results obtained with continuous gold films, polarization ratios higher than 80% are achieved for the smallest nanocrystals. This ratio decreases quickly when the nanocrystals size is increased.
Highlights
Elaboration of nanostructures to tailor the coupling between light and matter is a major area of research in the field of nanophotonics
Using spectrophotometric and AFM measurements, we checked that these characteristics are the same for the several gold films that were used in the following experiments
Previous experiments have shown that the emission of the NCs is not quenched when they are directly deposited on the gold film, the shell acting as a spacer.[23]
Summary
Elaboration of nanostructures to tailor the coupling between light and matter is a major area of research in the field of nanophotonics. Metamaterials[1] and many optical cavities such as photonic crystals[2] have been engineered over the past few years They cover a wide range of applications, including quantum information processing,[3] solar cells for photovoltaic,[4] or efficient analytical sensing in chemistry and molecular biology.[5]. A two-dimensional (2-D) random pattern of holes can provide promising thin films to enhance the efficiency of solar cells.[6,7] In the field of quantum optics, the spontaneous emission rate and the emission intensity can be increased following the Purcell approach.[8] The local density of states (LDOS) can be tuned in order to operate over a wide range of wavelengths.[9]
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