Broadband and high-efficiency spin-polarized wave engineering with PB metasurfaces

Area of Science:

• Optics and Photonics
• Metamaterials
• Nanotechnology

Background:

• Controlling circularly polarized (CP) light is crucial for advanced photonic applications.
• Existing Pancharatnam-Berry (PB) metasurfaces often exhibit low efficiency and narrow operational bandwidths.

Purpose of the Study:

• To propose a generic design scheme for PB metasurfaces that addresses low efficiency and narrow bandwidth limitations.
• To demonstrate high-efficiency and broadband functionalities using PB metasurfaces.

Main Methods:

• Design and fabrication of two PB meta-devices.
• Experimental verification of photonic spin Hall effect and focusing effect.
• Full-wave electromagnetic simulations for validation.

Main Results:

• Achieved high efficiencies up to 80% for the demonstrated meta-devices.
• Operated over an ultra-wide frequency band from 8.2 to 17.3 GHz.
• Experimental results closely matched simulation predictions.

Conclusions:

• The proposed design scheme enables high-performance and broadband PB meta-devices.
• The generic approach is extendable to higher frequency regimes.
• This work facilitates the development of diverse functionalities in meta-devices.