On-axis three-dimensional meta-holography enabled with continuous-amplitude modulation of light

Area of Science:

• Optics and Photonics
• Materials Science
• Nanotechnology

Background:

• Conventional 3D holography suffers from zero-order light, blurring images and requiring off-axis designs that waste space.
• Off-axis designs, while effective, reduce imaging space efficiency by at least half for holographic reconstruction.

Purpose of the Study:

• To propose and demonstrate an on-axis 3D holography technique that eliminates zero-order light.
• To utilize the full transmission space for holographic reconstruction.
• To develop ultracompact and high-density holographic recording solutions.

Main Methods:

• Development of Malus-assisted metasurfaces where each nanostructure acts as a nano-polarizer.
• Modulation of incident light's polarization-assisted amplitude using Malus law.
• Careful selection of nano-polarizer orientation angles to achieve amplitude modulation for zero-order light extinction.

Main Results:

• Successful elimination of zero-order light in on-axis 3D holography.
• Projection of on-axis 3-layer holographic images within the full imaging space.
• Experimental results align with theoretical predictions, validating the metasurface design.

Conclusions:

• The proposed Malus-assisted metasurface enables on-axis 3D holography with zero-order light extinction.
• This technology offers ultracompactness, on-axis reconstruction, and broadband response.
• Potential applications include high-density holographic recording for 3D objects.