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Restoring the silenced surface second-harmonic generation in split-ring resonators by magnetic and electric mode
Optics Express
|November 2, 2019
Summary
Researchers restored silenced second-harmonic generation (SHG) in plasmonic nanostructures by optimizing gap geometry. This breakthrough enhances nonlinear conversion efficiency and enables advanced optical applications like beam steering.
Area of Science:
- Plasmonics and Nanophotonics
- Nonlinear Optics
- Materials Science
Background:
- Surface second-harmonic generation (SHG) is key for nonlinear nanophotonics.
- Conventional plasmonic nanostructures often exhibit 'silenced SHG' due to nonlinear field cancellation in small gaps, reducing efficiency.
- Existing designs struggle to overcome this limitation for practical applications.
Purpose of the Study:
- To restore silenced SHG in plasmonic nanostructures.
- To enhance nonlinear conversion efficiency in gold split-ring resonators.
- To enable new far-field optical manipulation functionalities.
Main Methods:
- Proposed and demonstrated a tailored gap geometry in a gold split-ring resonator.
- Achieved spatial and frequency mode matching between magnetic and electric dipolar resonances.
- Analyzed the nonlinear field interactions and SHG emission characteristics.
Main Results:
- Successfully restored silenced SHG by avoiding nonlinear field cancellation.
- Achieved a 7-fold enhancement in SHG intensity compared to conventional designs.
- Demonstrated an SHG conversion efficiency of 1.49 × 10-8 in the near-infrared region.
Conclusions:
- Tailoring nanostructure gap geometry is effective in overcoming SHG cancellation.
- The restored SHG exhibits ideal electric dipole scattering, enabling far-field manipulation.
- This work paves the way for advanced nonlinear nanophotonics devices like beam steering and holograms.
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