20 January 2012 Mid-infrared field concentration of electrically generated surface plasmons polaritons
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Abstract
Surface-plasmon polaritons (SPPs) are electromagnetic waves which are bound at a metal/dielectric interface. SPPs dispersion relation allows bent propagation and can lead to sub-wavelength energy concentration. These properties, well known in the visible and near-infrared, are lost at mid-infrared and THz wavelengths. Here we demonstrate an integrated device which is able to recover and exploit the confinement properties of SPPs. It operates in the mid-infrared wavelengths by electrical injection, It generates plasmonic excitations whose dispersion is artificially tailored via proper patterning of a purely metallic surface. We illustrate the power of this approach by demonstrating bending, focusing and sub-wavelength energy concentration. We demonstrate a compact (<0.1 mm2) device, which is electrically driven and is able to generate, couple, propagate on a chip over macroscopic distances, and focus mid infrared radiation into a subwavelength region.
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A. Bousseksou, J.-P. Tetienne, R. Colombelli, A. Babuty, N. Rungsawang, Y. De Wilde, G. Beaudoin, I. Sagnes, "Mid-infrared field concentration of electrically generated surface plasmons polaritons", Proc. SPIE 8268, Quantum Sensing and Nanophotonic Devices IX, 826803 (20 January 2012); doi: 10.1117/12.906738; https://doi.org/10.1117/12.906738
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