Author Affiliations
1Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China2Physics Department, Fudan University, Shanghai 200433, China3Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China4Department of Communication & Information Engineering, Shanghai University, Shanghai 200444, China;show less
Fig. 1. Natural materials are made of “real atoms” (left) and metamaterials are made of “artificial meta-atoms” (right)
Fig. 2. Electromagnetic wave manipulations. (a)Electromagnetic wave manipulations with bulky device relying on the propagation phase; (b) electromagnetic wave manipulations with metasurface relying on the abruptly changed phase
Fig. 3. Development from homogeneous metamaterials (MMs), inhomogeneous MMs to gradient metasurfaces (MSs)
Fig. 4. Representative research works of Prof. Lei Zhou’s group from Fudan University in the field of metasurfaces
Fig. 5. Principle of electromagnetic polarization manipulation with metasurfaces
Fig. 6. Electromagnetic polarization manipulations with metasurfaces. (a) Reflective metasurface for high-efficiency polarization manipulations
[13]; (b) reflection phase spectra of reflective metasurface for different polarization cases
[13]; (c) ABA-multilayer transmission-type metasurface
[19]; (d) three typical polarization manipulation effects
[19] Fig. 7. Arbitrary electromagnetic wavefront manipulations via freely controlling the spatial reflection (or transmission) phase distributions on the metasurface
Fig. 8. Schematic pictures and experimental demonstrations to respectively achieve anomalous reflection and surface wave excitation with reflective metasurfaces of different gradient phases. (a)--(c) Anomalous reflection; (d)--(f) surface wave excitation
Fig. 9. Comparison of traditional surface plasmon coupler and new metasurface coupler. (a) Two key issues degrading the performance of traditional surface plasmon coupler, i.e., reflection loss and decoupling loss; (b)(c) new metasurface coupler suppresses two losses and realizes high-efficiency surface plasmon excitation
Fig. 10. Photonic spin Hall effect realized by Pancharatnam-Berry metasurface. (a) Jones matrix analysis of the meta-atom array; (b) principle of the Pancharatnam-Berry phase based on Poincaré sphere; (c)(d) photonic spin Hall effect achieved in the Pancharatnam-Berry metasurface
Fig. 11. Switchable functionalities achieved by tunable metasurface via changing electromagnetic phase dynamically
Fig. 12. Different electromagnetic functionalities achieved by reflective metasurfaces. (a)(b) Schematics of reflective metasurface and single-port resonator model based on coupled-mode theory; (c)(d) diagrams of the absorption and the span of reflection phase inside the metasurface as a function of Qr and Qa
Fig. 13. Widely tunable phase manipulation with graphene based metasurfaces. (a) Schematic of the graphene based tunable metasruface; (b) Smith curves of the reflection coefficient for the metasurface at different phase regions, i.e., underdamping, critical damping and overdamping; (c)(d) the dynamical reflection phase manipulations of the metasurface with different gate voltages