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All-Optical Tuning of Fano Resonances in Broken Symmetry GaAs Metasurfaces

Karl, Nicholas J.; Vabishchevich, P.P.; Liu, Sheng; Sinclair, Michael B.; Keeler, Gordon A.; Peake, Gregory M.; Brener, Igal

We demonstrate ultrafast tuning of Fano resonances in a broken symmetry III-V metasurface using optical pumping. The resonance is spectrally shifted by 10 nm under low pump fluences of < 100 uJ.cm-2.