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Plasmonic Core–Shell Nanowires for Enhanced Second-Harmonic Generation

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Abstract

We demonstrate the synthesis and characterization of core–shell nanowires consisting of a non-centrosymmetric KNbO3 core and a gold shell. This type of nanostructure combines the nonlinear optical properties of the core and the plasmonic resonance of the shell in the near infrared spectral range. We report successful spectroscopic measurements on coated single wires to characterize the resonant behavior of the gold shell. We present a theoretical model based on the electrostatic approximation to estimate the enhancement of second-harmonic generation in a nanowire due to the shell. It suggests a possible enhancement factor of up to 4,000 for a system with a nanoshell of 16 nm thickness at a wavelength of 900 nm.

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Acknowledgments

This work was supported and financed by the Jena School for Microbial Communication, the Carl Zeiss Foundation, and the Pro Chance program of the FSU Jena. Thanks go to C. Apfel for X-ray measurements, the IPHT for the equipment for zeta potential measurements, N. Janunts for setting up the spectroscope, and the nanooptics group at the Institute for Applied Physics for theoretical support.

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller Universität Jena, Max-Wien-Platz 1, 07743, Jena, Germany

    J. Richter, A. Steinbrück, T. Pertsch, A. Tünnermann & R. Grange

  2. Fraunhofer Institute of Applied Optics and Precision Engineering, Albert-Einstein-Straße7, 07745, Jena, Germany

    A. Tünnermann

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  1. J. Richter
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  2. A. Steinbrück
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  3. T. Pertsch
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  4. A. Tünnermann
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  5. R. Grange
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Correspondence to J. Richter.

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Richter, J., Steinbrück, A., Pertsch, T. et al. Plasmonic Core–Shell Nanowires for Enhanced Second-Harmonic Generation. Plasmonics 8, 115–120 (2013). https://doi.org/10.1007/s11468-012-9429-2

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  • DOI: https://doi.org/10.1007/s11468-012-9429-2

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