UCL Department of Electronic and Electrical Engineering


TALK: Linear and nonlinear photonic metasurfaces by Professor Guixin Li

12 February 2019, 12:00 pm–1:00 pm

Professor Guixin Li from Southern University of Science and Technology, Shenzhen (China) will give a talk on linear and nonlinear photonic metasurfaces and their important applications in many areas.

Event Information

Open to



Nicolae Panoiu


Barlow Room
Roberts Building
Torrington Place

By designing an ultrathin metasurface, which consists of spatially variant plasmonic structures with engineered geometric Berry phase, it is shown that spin-orbit coupling of light can be utilized to manipulate both the spin and orbital angular momentum of light. It was demonstrated that the spin dependent metasurface can be applied to design highly efficient optical holograms, which have important applications in many areas, including holographic displays, beam shaping, data storage, optical trapping, and optical tweezers.

In nonlinear optical regime, we applied the concept of nonlinear geometrical Berry phase for designing nonlinear photonic metasurfaces. For example, in a second- and third- harmonic generation processes, the plasmonic meta-atoms, with certain rotational symmetries, can acquire a nonlinear geometric Berry phase of 3θ, , where θ is the in-plane orientation angle of the meta-atoms. This nonlinear phase can be continuously tuned by from zero to 2π by simply varying θ. Several interesting applications such as nonlinear image encryption and nonlinear spin-orbit interaction will be discussed.


About the Speaker

Professor Guixin Li

Associate Professor at Southern University of Science and Technology, China

Guixin Li received BS degree in Department of Physics, Beijing Normal University in 2003 and Ph. D. degree from Department of Physics, Hong Kong Baptist University in 2009. He is currently an Associate Professor, 1000 Plan Young Scholar of China, Principle Investigator of Photonic Materials and Metamaterials at Department of Materials Science and Engineering, Shenzhen Institute for  Quantum Science and Engineering, Southern University of Science and Technology. His interests include Metasurface, Metamaterials, Nonlinear Optics. He has published around 50 peer-review papers in high impact journals such as Nature Physics, Nature Materials, Nature Nanotechnology, Physical Review Letters, etc.