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Second-Harmonic Enhancement from a Nonlinear Plasmonic Metasurface Coupled to an Optical Waveguide
Tsafrir Abir1,2,3, Mai Tal1,2,3, Tal Ellenbogen2,3
1Department of Condensed Matter Physics, School of Physics and Astronomy, Tel Aviv University, Tel Aviv 6779801, Israel.
Nano Letters
|April 4, 2022
Summary
Metasurfaces coupled to optical waveguides create strong collective resonances, enhancing light-matter interactions. This waveguide-assisted approach boosts second-harmonic generation, paving the way for nonlinear photonic circuits.
Area of Science:
- Photonics
- Nonlinear Optics
- Metasurface Science
Background:
- Metasurfaces utilize 2D nanoresonator arrays for enhanced light-matter interactions via collective optical responses.
- Coherent coupling within metasurfaces modifies their optical properties.
Purpose of the Study:
- To experimentally demonstrate waveguide-assisted collective resonances in metasurfaces.
- To investigate the impact of this coupling on second-harmonic generation (SHG).
- To explore the potential for nonlinear photonic circuits.
Main Methods:
- Experimental demonstration of metasurface-waveguide coupling.
- Measurement of transmitted second-harmonic generation.
- Complementary simulations to predict confined second-harmonic generation.
Main Results:
- Observed strong collective resonances arising from metasurface-waveguide coupling.
- Experimentally verified an 8-fold enhancement in transmitted second-harmonic generation compared to incoherent scattering.
- Simulations predicted a 100-fold enhancement for waveguide-confined second-harmonic generation.
Conclusions:
- Waveguide coupling provides a powerful method to engineer collective resonances in metasurfaces.
- This hybrid system offers enhanced control over nonlinear optical interactions, particularly second-harmonic generation.
- The findings present a promising route towards developing integrated nonlinear photonic circuits using metasurfaces.
