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physics.optics2026
Wavelength-selective nonlinear wavefront control in resonant thin-film lithium niobate metasurfaces
Madona Mekhael, Timo Stolt, Helena Weigand +4
Nonlinear metasurfaces offer compact control over frequency conversion and wavefront shaping. However, existing approaches, often based on geometric phase, lack wavelength selectiv…
physics.optics2023
Phase-Matched Second-Harmonic Generation from Metasurfaces Inside Multipass Cells
Madona Mekhael, Timo Stolt, Anna Vesala +4
We demonstrate a simple and scalable approach to increase conversion efficiencies of nonlinear metasurfaces by incorporating them into multipass cells and by letting the pump beam…
physics.optics2018
Less is more - enhancement of second-harmonic generation from metasurfaces by reduced nanoparticle density
Robert Czaplicki, Antti Kiviniemi, Mikko J. Huttunen +7
We investigate optical second-harmonic generation (SHG) from metasurfaces where noncentrosymmetric V-shaped gold nanoparticles are ordered into regular array configurations. In con…