A Polarization-Multiplexed Multifunctional Metalens for Triple-Focus Coplanar Imaging.

Area of Science:

• Optics and Photonics
• Materials Science
• Nanotechnology

Background:

• Metalenses offer advanced control over light polarization.
• Current metalenses typically image only two polarization states simultaneously.
• There is a need for metalenses with enhanced polarization control for integrated imaging devices.

Purpose of the Study:

• To propose and validate a polarization-multiplexed multifunctional metalens.
• To demonstrate simultaneous imaging of three polarization states using a single aperture.
• To advance the design of highly integrated polarization imaging systems.

Main Methods:

• Spatial multiplexing of three distinct meta-atom groups within a single metalens aperture.
• Theoretical analysis and computational simulations to validate metalens performance.
• Characterization of focal spot properties and focusing efficiency under circularly polarized light.

Main Results:

• The proposed metalens successfully generates three nearly diffraction-limited coplanar focal spots.
• Each focal spot exhibits distinct horizontal, vertical, and circular polarization properties.
• The metalens achieves a total focusing efficiency of 60% for triple-polarization imaging.

Conclusions:

• The developed metalens enables real-time triple-polarization imaging.
• This breakthrough offers significant potential for miniaturized and high-performance polarization imaging systems.
• The device overcomes limitations of dual-polarization metalenses, paving the way for advanced optical applications.