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Second harmonic generation on self-assembled tilted gold nanowires.

Alessandro Belardini1, Marco Centini, Grigore Leahu

  • 1Università di Roma La Sapienza, Via Scarpa 16, 00161 Roma, Italy. alessandro.belardini@uniroma1.it.

Faraday Discussions
|March 12, 2015
PubMed
Summary

This study shows tilted gold nanowire metasurfaces create optical chirality at oblique angles. Measuring second harmonic generation (SHG) reveals the geometry

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Area of Science:

  • Nanophotonics and Metamaterials
  • Plasmonics
  • Chirality in Optics

Background:

  • Metasurfaces offer unique optical properties through engineered nanostructures.
  • Optical chirality is crucial for applications in sensing, imaging, and quantum technologies.
  • Geometric asymmetry in nanostructures can break fundamental symmetries, leading to chiral responses.

Purpose of the Study:

  • To investigate the optical chiral response of a metasurface composed of tilted gold nanowires.
  • To explore the symmetry breaking induced by the specific geometry of the nanowires.
  • To demonstrate the utility of second harmonic generation (SHG) for characterizing chiral nanostructures.

Main Methods:

  • Fabrication of a metasurface using tilted gold nanowires.

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  • Optical measurements of the metasurface at non-normal incidence angles.
  • Second harmonic generation (SHG) measurements using circularly polarized pulsed light.

    • Main Results:

    • The metasurface exhibits an induced optical chiral response when illuminated at non-normal incidence.
    • Second harmonic generation (SHG) signals were successfully measured, correlating with the metasurface geometry.
    • The results confirm that the tilted nanowire geometry breaks symmetry and induces chirality.

    Conclusions:

    • Tilted gold nanowire metasurfaces are effective in generating optical chirality.
    • Second harmonic generation (SHG) is a powerful technique for probing the chiral morphology of nanostructures.
    • The study highlights the importance of geometric design in controlling optical properties of metasurfaces.