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Tailoring Second Harmonic Diffraction in GaAs Metasurfaces via Crystal Orientation

Vabishchevich, P.P.; Vaskin, A.; Addamane, S.; Liu, S.; Sharma, A.P.; Balakrishnan, G.; Reno, John L.; Keeler, G.A.; Sinclair, Michael B.; Staude, I.; Brener, Igal

We use GaAs metasurfaces with (111) crystal orientation to channel the second harmonic generation (SHG) into the zero-diffraction order that is suppressed for SHG obtained from GaAs metasurfaces with (100) orientation.