Mixing the Light Spin with Plasmon Orbit by Nonlinear Light-Matter Interaction in Gold

Spektor, G. and Kilbane, D. and Mahro, A. K. and Hartelt, M. and Prinz, E. and Aeschlimann, M. and Orenstein, M. (2019) Mixing the Light Spin with Plasmon Orbit by Nonlinear Light-Matter Interaction in Gold. Physical Review X, 9 (2). ISSN 2160-3308

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Transformation of light carrying spin angular momentum (SAM) to optical field vortices carrying orbital angular momentum (OAM) has been of wide interest in recent years. The interactions between two optical fields, each carrying one of those degrees of freedom, and furthermore, the transfer of the resulting angular momentum product to matter are seldom discussed. Here, we measure the interaction between 3D light carrying axial SAM and 2D plasmon-polariton vortices carrying high-order transverse OAM. The interaction is mediated by two-photon absorption within a gold surface, imprinting the resulting angular-momentum mixing into matter by excitation of electrons that are photo-emitted into vacuum. Interestingly, the spatial distribution of the emitted electrons carries the signature of a subtraction of the spin from the orbit angular momenta. We show experimentally and theoretically that the absorptive nature of this interaction leads to both single and double photon-plasmon angular momentum mixing processes by one- and two- photon interactions. Our results demonstrate high order angular momenta light-matter interactions, provide a glimpse into specific electronic excitation routes, and may be applied in future electronic sources and coherent control.

Item Type: Article
Additional Information: Funding Information: G. S. and M. O. acknowledge support from the Israeli Centers of Research Excellence “Circle of Light.” We acknowledge the Micro-Nano Fabrication Unit (MNFU) Technion for support with sample fabrication. D. K. acknowledges funding from the Irish Research Council and the Marie Curie Actions ELEVATE fellowship. A. K. M., M. H., E. P., and M. A. acknowledge funding from the DFG within the program SFB/TRR 173: “SPIN+X.” We acknowledge the Nano Structuring Center Kaiserslautern for support with the sample fabrication. E. P. acknowledges funding from the DFG through the Excellence Initiative by the Graduate School Materials Science in Mainz (GSC 266). Publisher Copyright: © 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100
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Depositing User: Admin SSL
Date Deposited: 19 Oct 2022 23:11
Last Modified: 26 Jun 2023 03:00
URI: http://repository-testing.wit.ie/id/eprint/4522

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