Latest article : fluorescence directional sorting with antennas

23 Mai 2011 , Rédigé par JW Publié dans #Recent research work

Despite intense recent research on optical antennas, tuning the directionality of fluorescence emission remains an open challenge for emitters with random positions and orientations. We address this issue in a recent Nano Letters report, and propose a class of optical antennas to control the fluorescence emission directivity for molecules in solution.

Following on our previous article “Bright Unidirectional Fluorescence Emission of Molecules in a Nanoaperture with  Plasmonic Corrugations” by H.  Aouani  et  al (Nano Lett. 2011, 11, 637–644), new scientific findings are now described and analyzed:

1) We describe new design paths for plasmonic antennas to tune the emission directivity based on physical optics interference concepts. This manuscript provides the first complete characterization of the interference phenomenon leading to fluorescence beaming, both experimentally and theoretically.

2) The key result is that for each emission wavelength the fluorescence beam can be directed along a specific direction with a given angular width. For the first time, we demonstrate directional photon sorting between emission beams of spectrally different molecules.