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Nonlinear Surface Lattice Resonance in Plasmonic Nanoparticle Arrays.
Lior Michaeli1,2, Shay Keren-Zur1, Ori Avayu1
1Department of Physical Electronics, Faculty of Engineering, Tel-Aviv University, Tel-Aviv 6779801, Israel.
Physical Review Letters
|July 1, 2017
Summary
Researchers achieved over 30-fold enhancement in second-harmonic generation using split-ring resonators at oblique incidence. This enhancement is linked to nonlinear surface lattice resonances and dark plasmon modes becoming bright.
Area of Science:
- Plasmonics
- Nonlinear Optics
- Metamaterials
Background:
- Split-ring resonators exhibit unique plasmonic properties.
- Second-harmonic generation (SHG) is a key nonlinear optical process.
- Surface lattice resonances (SLRs) can enhance light-matter interactions.
Purpose of the Study:
- To experimentally investigate SHG from split-ring resonator arrays at oblique incidence.
- To identify conditions for significant SHG enhancement.
- To theoretically confirm the underlying physical mechanisms.
Main Methods:
- Experimental measurements of SHG from split-ring resonator arrays.
- Analysis using a nonlinear Rayleigh-Wood anomaly relation.
- Theoretical modeling using the extended coupled dipole approximation.
Main Results:
- Over 30-fold enhancement in SHG observed at oblique incidence.
- Experimental results align with nonlinear SLR predictions.
- Dark localized surface plasmon modes were shown to become bright collectively.
Conclusions:
- Oblique incidence enables significant SHG enhancement in split-ring resonator arrays.
- Nonlinear surface lattice resonances are crucial for this enhancement.
- Collective coupling transforms dark plasmon modes into bright ones, boosting nonlinear emission.
