Fig. 2: Nonlinear interferometry by an all-dielectric metasurface.
From: All-optical polarization encoding and modulation by nonlinear interferometry at the nanoscale
a Experimentally delay-averaged BFP image showing the upconverted light power at 3ω (SFG + THG) from an AlGaAs metasurface with a lattice periodicity of 1000 nm. The image is produced by averaging 40 frames, with a relative delay between the pump pulses at ω and 2ω increasing in steps of 1 fs. The linear polarization of the pump beams is parallel to the x axis, with powers Pω = 11 mW and P2ω = 22 μW, respectively. b–i Delay traces of eight diffraction orders. The power diffracted at each phase delay is obtained by integrating a 13 × 13-pixel area around the center of the diffraction spots and subtracting the background
