Efficient All-Dielectric Diatomic Metasurface for Linear Polarization Generation and 1-Bit Phase Control

Area of Science:

• Photonics and Nanotechnology
• Optics and Light Manipulation
• Materials Science

Background:

• Optical metasurfaces offer advanced control of light at the subwavelength scale.
• Multifunctional polarization metasurfaces are crucial for miniaturizing photonic systems.
• Integrating diverse optical functions onto a single platform is a key research goal.

Purpose of the Study:

• To propose and demonstrate an efficient all-dielectric diatomic metasurface.
• To achieve nanoscale linear polarization with controllable angles and high performance.
• To integrate polarization control with phase modulation for novel metadevices.

Main Methods:

• Theoretical analysis and numerical simulations of a diatomic metasurface unit cell.
• Fabrication and experimental characterization of metasurface samples.
• Design of a metasurface beam splitter by combining polarization and phase modulation.

Main Results:

• Demonstrated a nanoscale linear polarizer with 96.2% transmission efficiency and 32.8 dB extinction ratio at 690 nm.
• Achieved 1-bit phase modulation capability without compromising polarization control or transmission efficiency.
• Successfully demonstrated a novel metasurface beam splitter integrating nonpolarizing beam splitting and linear polarization.

Conclusions:

• The proposed diatomic metasurface offers efficient polarization control and phase modulation.
• This platform enables the creation of multifunctional metadevices, such as integrated beam splitters.
• Further optimization can lead to advanced wavefront shaping functionalities with full 2π phase control.