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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

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Surface lattice resonances in second-harmonic generation from metasurfaces.

Robert Czaplicki, Antti Kiviniemi, Janne Laukkanen

|June 16, 2016

Summary

Surface-lattice resonances (SLRs) significantly enhance second-harmonic generation (SHG) in metal nanoparticle arrays by tuning incident light. Optimizing incident angles boosts SHG enhancement up to tenfold, though diffraction anomalies can disrupt this effect.

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Area of Science:

Plasmonics
Nonlinear Optics
Nanophotonics

Background:

Surface-lattice resonances (SLRs) are collective electron oscillations in ordered nanoparticle arrays.
Second-harmonic generation (SHG) is a nonlinear optical process where two photons of the fundamental frequency combine to generate one photon at double the frequency.
Understanding resonance phenomena is crucial for enhancing nonlinear optical signals.

Purpose of the Study:

To investigate the influence of SLRs on SHG from metal nanoparticle arrays.
To explore the effect of incident angle on SLR-enhanced SHG.
To identify methods for maximizing SHG enhancement in such systems.

Main Methods:

Fabrication of metal nanoparticle arrays.
Optical characterization using angle-resolved spectroscopy.
Measurement of SHG intensity as a function of incident angle and wavelength.

Main Results:

SLRs significantly impact SHG, particularly when the sample is rotated from normal incidence.
Adjusting the incident angle allows tuning of SLRs to the fundamental wavelength, enhancing SHG.
An enhancement factor of 10 in SHG was observed compared to normal incidence.
Diffraction anomalies at specific angles can disrupt SLRs, leading to increased damping and reduced SHG enhancement.

Conclusions:

SLRs offer a viable pathway for substantial enhancement of SHG in nanoparticle arrays.
Precise control over incident angle is critical for optimizing SLR-based SHG enhancement.
Diffraction anomalies represent a limiting factor that must be managed for practical applications.