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Recently, the implementation of plasmonic nanoantennas has opened new possibilities to investigate the nanoscale dynamics of individual biomolecules in living cells. However, studies so far have been restricted to single molecular species as the narrow wavelength resonance of gold‐based nanostructures precludes the simultaneous interrogation of different fluorescently labeled molecules. Here, broadband...
Broadband Plasmonic Nanoantennas
A plasmonic antenna is engineered at the apex of a near‐field probe to illuminate a living cell at the nanoscale. This nanosource of light allows monitoring the fluorescence fluctuations of diffusing molecules inside this tiny illumination volume, which allows resolving molecular diffusion within nanoclusters and distinguishes it from nanocluster diffusion. More details...
Over the last decade, we have witnessed an outburst of many different optical techniques aimed at breaking the diffraction limit of light, providing super‐resolution imaging on intact fixed cells. In parallel, single‐molecule detection by means of fluorescence has become a common tool to investigate biological interactions at the molecular level both in vitro and in living cells. Despite these advances,...
Plasmonic nanoantennas are promising tools to control and manipulate optical fields at the nanometre scale [1,2]. In this work, we introduce a novel type of plasmonic nanoantenna especially designed for enhanced single molecule analysis in solutions at high concentrations. The nanoantenna is based on a dimer made of two gold half-spheres surrounded by a box aperture and is milled in a gold film by...
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