Polarization-switchable holograms based on efficient, broadband multifunctional metasurfaces in the visible regime

Area of Science:

• Photonics and Nanotechnology
• Electromagnetics
• Optical Engineering

Background:

• Metasurfaces offer advanced phase manipulation for electromagnetic waves.
• Integrating multiple optical functions onto a single surface is a key advantage of metasurfaces.
• Existing holographic technologies can be bulky and complex.

Purpose of the Study:

• To demonstrate a high-efficiency, reflective meta-hologram for visible light.
• To utilize an ultra-thin gap surface plasmon-based metasurface for holographic applications.
• To enable polarization-controlled dual-image reconstruction with high fidelity.

Main Methods:

• Designing and fabricating an ultra-thin (~λ/4 thick) gap surface plasmon-based metasurface.
• Precisely sampling predesigned image phase and amplitude to the metasurface unit cells.
• Utilizing polarization control for dual image reconstruction.

Main Results:

• Achieved a high holographic efficiency of up to ~60% for visible light.
• Demonstrated successful reconstruction of polarization-controlled dual images.
• Obtained a high polarization extinction ratio and high fidelity in the reconstructed images.

Conclusions:

• The developed reflective meta-hologram is highly efficient and compact.
• This technique expands possibilities for high-quality hologram generation using nanophotonic devices.
• The study paves the way for diverse holography-related applications in the visible spectrum.