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  • Title: Sub-wavelength energy concentration with electrically generated mid-infrared surface plasmons.
    Author: Bousseksou A, Babuty A, Tetienne JP, Moldovan-Doyen I, Braive R, Beaudoin G, Sagnes I, De Wilde Y, Colombelli R.
    Journal: Opt Express; 2012 Jun 18; 20(13):13738-47. PubMed ID: 22714439.
    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.
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