Universal method for the synthesis of arbitrary polarization states radiated by a nanoantenna
Francisco J. Rodr´iguez-Fortu ˜ no, Daniel Puerto, Amadeu Griol, Laurent Bellieres, Javier Mart´i, Alejandro Mart´inez
Laser & Photonics Reviews
Vol 8, No. 3
pp L27 - L31
nanoantenna, silicon photonics, polarization synthesis, nanophotonics
Optical nanoantennas efficiently convert confined optical energy into free-space radiation. The polarization of the emitted radiation depends mainly on nanoantenna shape, so it becomes extremely difficult to manipulate it unless the nanostructure is physically altered. Here, a simple way is demonstrated to synthetize the polarization of the radiation emitted by a single nanoantenna so that every point on the Poincaré sphere becomes attainable. The nanoantenna consists of a single scatterer created on a dielectric waveguide and fed from its both sides so that the polarization of the emitted optical radiation is controlled by the amplitude and phase of the feeding signals. The nanoantenna is created on a silicon chip using standard top-down nanofabrication tools, but the method is universal and can be applied to other materials, wavelengths and technologies. This work will open the way towards the synthesis and control of arbitrary polarization states in nano-optics.
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