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Enhanced second-harmonic generation from resonant GaAs gratings.
D de Ceglia1, G D'Aguanno, N Mattiucci
1AEgis Technologies Inc., Huntsville, Alabama 35806, USA. ddeceglia@nanogenesisgroup.com
Optics Letters
|March 4, 2011
Summary
We theoretically demonstrate significant enhancements in second harmonic generation (SHG) using nonlinear GaAs gratings. Exciting guided mode resonances dramatically boosts conversion efficiency, outperforming bulk materials.
Area of Science:
- Nonlinear optics
- Materials science
- Photonics
Background:
- Second harmonic generation (SHG) is crucial for frequency conversion.
- Enhancing SHG efficiency in nonlinear materials is an ongoing challenge.
- GaAs is a promising material for photonic applications.
Purpose of the Study:
- To theoretically investigate SHG in nonlinear GaAs gratings.
- To explore the role of guided mode resonances in enhancing SHG.
- To predict conversion efficiencies compared to bulk and etalon structures.
Main Methods:
- Theoretical study of nonlinear optical phenomena.
- Analysis of guided mode resonances in gratings.
- Numerical simulations of light-matter interaction in GaAs structures.
Main Results:
- Large enhancement of SHG conversion efficiency observed.
- Guided mode resonances lead to sharp spectral features and enhanced local fields.
- Significant SHG enhancement achieved even with strong linear absorption at the harmonic wavelength.
- Predicted SHG efficiencies in GaAs gratings are ~5 orders of magnitude higher than in bulk GaAs.
Conclusions:
- Nonlinear GaAs gratings offer a pathway to dramatically improved SHG.
- Guided mode resonance excitation is a key mechanism for efficient frequency conversion.
- These findings pave the way for advanced photonic devices utilizing enhanced nonlinearities.
