We report the generation of spin controlled OAM of light in harmonic generations by using ultrathin photonic metasurfaces. The spin manipulation of OAM mode of harmonic waves is experimentally verified by using second harmonic generation (SHG) from gold meta-atom with three-fold rotational symmetry. By introducing nonlinear phase singularity into the metasurface devices, we successfully generate and measure the topological charges of spin-controlled OAM mode of SHG through an on-chip metasurface interferometer. The nonlinear photonic metasurface proposed in this work not only opens new avenues for manipulating the OAM of nonlinear optical signals, but also benefits the understanding of the nonlinear spin-orbit interaction of light in nanoscale devices.
Guixin Li, "Geometric phase and nonlinear photonic metasurfaces," Proc. SPIE 10639, Micro- and Nanotechnology Sensors, Systems, and Applications X, 106390O (Presented at SPIE Defense + Security: April 16, 2018; Published: 14 May 2018); https://doi.org/10.1117/12.2304724.
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