Dr. Xingjie Ni Nanoscale Science and Engineering Center University of California, Berkeley Faculty Host – Roberto Paiella Metasurfaces for Planar Photonics and Spin Optoelectronics Abstract Metamaterials, or artificially engineered, subwavelength-scale structures, allow us to control the behavior of electromagnetic/acoustic/thermal fields with flexibility and performance that are unattainable with naturally available materials. Their two-dimensional counterparts – metasurfaces extend these capabilities even further. Optical metasurfaces offer fascinating possibilities of controlling light with surface-confined flat components which can manipulate the phase and amplitude of the scattered light directly. Many new physics and unparalleled applications have been demonstrated using metasurfaces such as bending the light abnormally, generating optical vortex beams, and enhancing the optical spin-orbit interaction. In my talk, I will focus on some recent developments on metasurfaces which lead to several new applications like building ultra-thin planar micro-lenses, creating high-resolution holograms, direct coupling between photon-spin and electron orbital momenta, and engineering remote quantum vacuum. Short Bio Xingjie Ni received his B.S. degree in Engineering Physics in 2005 and his M.S. degree in Automation in 2007 from Tsinghua University, Beijing, China. He completed his Ph.D. degree in Electrical and Computer Engineering at Purdue University, West Lafayette, Indiana in 2012, under the supervision of Vladimir M. Shalaev. Currently he is a postdoctoral fellow at University of California, Berkeley, working in the laboratory of Xiang Zhang. His research interests are in nanophotonics and optoelectronics, which encompass photonic/plasmonic nanodevices, electromagnetic metamaterials, integrated photonics, photonic sensors, transformation optics devices, nonlinear optics, optical communications, photovoltaics, and optical quantum information processing. Light refreshments will be available to all event attendees at 3:45 pm, outside of PHO 339.