Efficient nonlinear metasurfaces by using multiresonant high-Q plasmonic arrays
Research output: Contribution to journal › Article › Scientific › peer-review
|Journal||Journal of the Optical Society of America B: Optical Physics|
|Publication status||Published - 2019|
|Publication type||A1 Journal article-refereed|
We numerically investigate second-harmonic generation from multiresonant plasmonic metasurfaces by designing an array consisting of L-shaped aluminum nanoparticles that simultaneously supports two surface lattice resonances with relatively high quality factors (>100). Using an approach based on the nonlinear discrete-dipole approximation, we predict an over million-fold enhancement of the emitted second-harmonic intensity from a particle at the center of the metasurface compared to an individual particle and estimate that conversion efficiencies of around 10-5 could be achievable from the surface. Our results are an important step towards making nonlinear metasurfaces practical for nonlinear applications, such as for frequency conversion.