Abstract
Abstract One compound metasurface with multiple functions and precise complex amplitude modulation is beneficial to photonic integration. Here, all-silicon bifunctional metasurfaces capable of independent amplitude and phase modulation in two circular polarized channels are proposed, which encode complex amplitude information by integrating propagation phase and Pancharatnam-Berry phase. A switchable power-controllable axial bifocal metalens directly illustrates the feasibility of the proposed modulation scheme. Another switchable power-controllable horizontal/vertical bifocal metalens characterizes the versatility and flexibility of this approach. The experimental results agree well with the simulations and theoretical expectations. In addition, we also discuss the broadband performance of the proposed metalens and the dynamic focusing behavior under optical pumping. The proposed approach can directly generate editable amplitude and phase profiles and can find applications in dynamic holography, dynamic display, and other fields.
Highlights
Metasurfaces, the two-dimensional form of metamaterials, are planar optical elements composed of artificially designed meta-atoms
A switchable power-controllable axial bifocal metalens directly illustrates the feasibility of the proposed modulation scheme
We propose all-silicon bifunctional metasurfaces that can achieve independent amplitude and phase modulation in two circularly polarized channels
Summary
Metasurfaces, the two-dimensional form of metamaterials, are planar optical elements composed of artificially designed meta-atoms. To completely control the propagation of electromagnetic wave, in addition to the parameters of polarization and phase, amplitude is essential Compared with those phase-only metasurfaces, devices that can simultaneously modulate amplitude and phase distributions have better performance of wavefront shaping, and have advantages in high-quality holography, generation of complex light fields, and so on [18, 38,39,40,41]. We propose all-silicon bifunctional metasurfaces that can achieve independent amplitude and phase modulation in two circularly polarized channels. These metasurfaces combine propagation phase and PB phase, and encode complex amplitude information into these two channels. Such a scheme provides a new choice for the development of multifunctional photonic devices
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