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Nonlinear optics of complex plasmonic structures: linear and third-order optical response of orthogonally coupled metallic nanoantennas

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Abstract

We investigate the polarization-resolved linear and third-order optical response of plasmonic nanostructure arrays that consist of orthogonally coupled gold nanoantennas. By rotating the incident light polarization direction, either one of the two eigenmodes of the coupled system or a superposition of the eigenmodes can be excited. We find that when an eigenmode is driven by the external light field, the generated third-harmonic signals exhibit the same polarization direction as the fundamental field. In contrast, when a superposition of the two eigenmodes is excited, third-harmonic can efficiently be radiated at the perpendicular polarization direction. Furthermore, the interference of the coherent third-harmonic signals radiated from both nanorods proves that the phase between the two plasmonic oscillators changes in the third-harmonic signal over \(3\pi\) when the laser is spectrally tuned over the resonance, rather than over \(\pi\) as in the case of the fundamental field. Finally, almost all details of the linear and the nonlinear spectra can be described by an anharmonic coupled oscillator model, which we discuss in detail and which provides deep insight into the linear and the nonlinear optical response of coupled plasmonic nanoantennas.

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Acknowledgments

We gratefully acknowledge financial support from the DFG (SPP1391, ultrafast nanooptics), from the Baden-Württemberg Stiftung (Kompetenznetz Funktionelle Nanostrukturen), from the BMBF (13N10146), from the ERC (Complexplas), and the Alexander von Humboldt Foundation.

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Authors and Affiliations

  1. 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569, Stuttgart, Germany

    Bernd Metzger, Mario Hentschel, Maxim Nesterov & Harald Giessen

  2. Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany

    Thorsten Schumacher & Markus Lippitz

  3. Experimental Physics III, University of Bayreuth, Universitätsstrasse 30, 95447, Bayreuth, Germany

    Thorsten Schumacher & Markus Lippitz

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  1. Bernd Metzger
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  2. Mario Hentschel
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  4. Thorsten Schumacher
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  6. Harald Giessen
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Correspondence to Bernd Metzger.

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This article is part of the topical collection “Ultrafast Nanooptics” guest edited by Martin Aeschlimann and Walter Pfeiffer.

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Metzger, B., Hentschel, M., Nesterov, M. et al. Nonlinear optics of complex plasmonic structures: linear and third-order optical response of orthogonally coupled metallic nanoantennas. Appl. Phys. B 122, 77 (2016). https://doi.org/10.1007/s00340-016-6348-5

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  • DOI: https://doi.org/10.1007/s00340-016-6348-5

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