2 papers
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.optics2026
Active control of phase matching in nonlinear metasurfaces using Pancharatnam--Berry phase
Madona Mekhael, Roman Calpe, Tommi K. Hakala +2
Reconfiguring the spectral output of nonlinear metasurfaces after fabrication remains challenging. We address this by exploiting the nonlinear Pancharatnam--Berry phase of …