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Nonlinear Self-Confined Plasmonic Beams: Experimental Proof

Abstract : Controlling low power light beam self-confinement with ultrafast response time opens up opportunities for the development of signal processing in microdevices. The combination of a highly nonlinear medium with the tight confinement of plasmonic waves offers a viable but challenging configuration to reach this goal. In the present work, a beam propagating in a plasmonic structure that undergoes a strongly enhanced self-focusing effect is reported for the first time. The structure consists of a chalcogenide-based four-layer planar geometry engineered to limit plasmon propagation losses while exhibiting efficient Kerr self-focusing at moderate power. As expected from theory, only TM-polarized waves exhibit such a behavior. Different experimental arrangements are tested at telecom wavelengths and compared with simulations obtained from a dedicated model. The observed efficient beam reshaping takes place over a distance as low as 100 μm, which unlocks new perspectives for the development of integrated photonic devices.
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Submitted on : Monday, October 19, 2020 - 10:10:17 AM
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This is an open access article published under an ACS AuthorChoice License, which permitscopying and redistribution of the article or any adaptations for non-commercial purposes : https://pubs.acs.org/page/policy/authorchoice_termsofuse.html

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Tintu Kuriakose, Gilles Renversez, Virginie Nazabal, Mahmoud M. R. Elsawy, Nathalie Coulon, et al.. Nonlinear Self-Confined Plasmonic Beams: Experimental Proof. ACS photonics, American Chemical Society,, 2020, 7, pp.2562-2570. ⟨10.1021/acsphotonics.0c00906⟩. ⟨hal-02961176⟩

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