Ultrafast and Nonlinear Semiconductor Metasurfaces

Resonant dielectric metasurfaces offer unparalleled degrees of freedom to design flat-optics and study fundamental aspects of light mater interaction due to the freedom to use optical resonances of electrical and magnetic character and different symmetries, extremely low loss when operating below the semiconductor band gap, and controlled coupling and interactions between the meta-atoms. Additionally, transient sub-picosecond behavior can be imparted to the metasurface using pulsed pumping and controlling of carrier dynamics and decay. In this talk I will overview some of our work based on such metasurfaces made from III-V semiconductors. 1 In particular, I will focus on harmonic generation, 2 - 5 ultrafast switching and diffraction, 6 - 8 transient frequency conversion 9 and perfect absorbing metasurfaces for THz emission and detection. 10 - 15