Full-space metasurface holograms in the visible range

Area of Science:

• Optics and Photonics
• Metamaterials and Nanophotonics

Background:

• Conventional metasurface holography is typically limited to either transmission or reflection space.
• Achieving simultaneous holographic projection in both spaces requires complex or multi-layer designs.

Purpose of the Study:

• To demonstrate a single-layer dielectric metasurface for simultaneous dual-space holographic imaging.
• To expand the field-of-view of metasurface holography from half-space to full-space.

Main Methods:

• Utilized two types of dielectric nanobricks as half-wave plates for geometric phase modulation.
• Engineered nanobricks for selective reflection (magnetic resonance) or transmission (non-resonance).
• Randomly interleaved nanobricks with controlled orientation angles to create a trans-reflective metasurface.

Main Results:

• Successfully projected two independent holographic images in transmission and reflection spaces concurrently.
• Experimental results closely matched theoretical predictions for the trans-reflective meta-holography.
• Demonstrated a full-space metasurface hologram with a single-layer design.

Conclusions:

• Developed a novel single-layer dielectric metasurface for full-space holographic imaging.
• This trans-reflective meta-holography offers a significant advancement over conventional methods.
• Potential applications include optical sensing, advanced image displays, and optical data storage.