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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Published on: November 21, 2019

Experiments on second- and third-harmonic generation from magnetic metamaterials.

Matthias W Klein¹, Martin Wegener, Nils Feth

¹Institut für Angewandte Physik and DFG-Center for Functional Nanostructures, Universität Karlsruhe, Wolfgang-Gaede-Strasse 1, D-76131 Karlsruhe, Germany.

|June 18, 2009

Summary

Photonic metamaterials exhibit enhanced optical nonlinearities. Experiments show magnetic metamaterials with split-ring resonators generate strong second- and third-harmonic signals, especially at magnetic-dipole resonances.

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Area of Science:

Photonics
Materials Science
Nonlinear Optics

Background:

Photonic metamaterials offer significantly enhanced optical nonlinearities compared to natural materials.
This enhancement arises from the synergistic effects of magnetic resonances and local-field amplification.

Purpose of the Study:

To experimentally investigate second- and third-harmonic generation in magnetic metamaterials.
To identify the specific resonant properties responsible for enhanced nonlinear optical responses.

Main Methods:

Fabrication of magnetic metamaterials using nanoscale gold split-ring resonators.
Excitation of metamaterials and control samples using 170-femtosecond pulses at a 1.5-micrometer wavelength.
Measurement and analysis of second- and third-harmonic generation signals.

Main Results:

Observed significant second- and third-harmonic generation from the gold split-ring resonator metamaterials.
Identified strongest nonlinear optical signals correlating with resonances of magnetic-dipole character.
Demonstrated enhanced nonlinearities in metamaterials compared to control samples.

Conclusions:

Magnetic metamaterials, particularly those supporting magnetic-dipole resonances, are highly effective for nonlinear optical applications.
Nanoscale split-ring resonators provide a viable platform for achieving large optical nonlinearities.
These findings pave the way for novel photonic devices leveraging enhanced harmonic generation.