Speaker: Polina Vabishchevich, Postdoctoral Appointee in Applied Photonic Microsystems department in Sandia National Laboratories, NM, USA.
Title: III-V semiconductor metasurfaces: frequency mixing and all-optical tuning
Abstract: Metasurfaces – 2D versions of metamaterials – are engineered structures that consist of collections of inclusions (meta-atoms). Metasurfaces derive their optical response from the composition, shape, and dimensions of the meta-atoms, which are typically smaller than the wavelength of the light. Metasurfaces are capable of replicating or expanding the optical response of standard optical components in a submicron-thin form-factor. One of the intriguing functionalities of metasurfaces is their tunability when they are made of, or integrated with tunable materials such as semiconductors, liquid crystals, phase change materials, and others. In this talk, I will focus on linear and nonlinear properties of metasurfaces made from III-V semiconductors. First, I will show our results on frequency mixing in GaAs-based metasurfaces. Second, I will focus on the ultrafast all-optical tuning of the optical response of metasurfaces using the generation of free carriers in the semiconductor meta-atoms. I will show different designs and applications of optically-tunable metasurfaces, including ultrafast all-optical switching and wavefront shaping.
Bio: Dr. Polina Vabishchevich obtained her specialist degree in Physics from Lomonosov Moscow State University, Russia in 2010. Following this, she defended her PhD in 2016 in Laser Physics from the same university. In 2017 she became a Postdoctoral Appointee in Applied Photonic Microsystems department in Sandia National Laboratories, NM, USA. Her research interests include the linear and nonlinear optical properties of metallic and all-dielectric metasurfaces. Specifically, her recent research is focused on nonlinear optics and ultrafast all-optical tuning in semiconductor-based metasurfaces.
Join this seminar on Zoom by clicking here.
For more information contact Leah Abraha at labraha@gc.cuny.edu