Sub-wavelength energy concentration with electrically generated mid-infrared surface plasmonsReport as inadecuate

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* Corresponding author 1 IEF - Institut d-électronique fondamentale 2 Institut Langevin ondes et images 3 LPN - Laboratoire de photonique et de nanostructures 4 Institut d-Electronique Fondamentale

Abstract : While freely propagating photons cannot be focused below their diffraction limit, surface-plasmon polaritons follow the metallic surface to which they are bound, and can lead to extremely sub-wavelength energy volumes. These properties are lost at long mid-infrared and THz wavelengths where metals behave as quasi-perfect conductors, but can in principle be recovered by artificially tailoring the surface-plasmon dispersion. We demonstrate - in the important mid-infrared range of the electromagnetic spectrum - the generation onto a semiconductor chip of plasmonic excitations which can travel along long distances, on bent paths, to be finally focused into a sub-wavelength volume. The demonstration of these advanced functionalities is supported by full near-field characterizations of the electromagnetic field distribution on the surface of the active plasmonic device.

Keywords : surface plasmons near-field characterisation semiconductor lasers

Author: Adel Bousseksou - Arthur Babuty - Jean-Philippe Tetienne - Ioana Cristina Moldovan Doyen - Rémy Braive - Grégoire Beaudoin - Is



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