Flat nonlinear optics with ultrathin highly nonlinear metasurfaces
Extending the `flat optics' paradigm to the nonlinear optics faces important challenges, since, for any practical situation, we are required to simultaneously achieve sub diffraction phase control and efficient frequency conversion in metasurfaces of sub wavelength thickness. Here, we experimentally demonstrate giant nonlinear response and continuous phase control of the giant nonlinear response in metasurfaces based on plasmonic nanoresonators coupled to intersubband transitions in semiconductor multi quantum wells. Over 0.075% of second harmonic power conversion efficiency is achieved experimentally in a 400 nm thick metasurface using 10 microns wavelength pump with 20 kW/cm2 intensity.
2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS)