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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
Published on: September 25, 2020
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Broadband and chiral binary dielectric meta-holograms
Mohammadreza Khorasaninejad1, Antonio Ambrosio2, Pritpal Kanhaiya3
1Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
Science Advances
|July 8, 2016
Summary
Researchers developed high-efficiency holograms using subwavelength structured surfaces (metasurfaces). These compact devices offer broadband and chiral imaging, paving the way for advanced optical applications like wearable technology.
Area of Science:
- Optics and Photonics
- Metamaterials Science
Background:
- Metasurfaces enable compact, optically thin devices with advanced functionalities.
- The detour phase concept is key to hologram design.
Purpose of the Study:
- To demonstrate high-efficiency holograms with broadband and chiral imaging capabilities.
- To utilize subwavelength structured microgratings for enhanced holographic performance.
Main Methods:
- Revisiting the detour phase concept and replacing binary hologram apertures with subwavelength microgratings.
- Compensating for dispersion using the microgratings' inherent dispersion properties.
- Incorporating geometric phase for chiral imaging functionalities.
Main Results:
- Achieved high-efficiency holograms with broadband operation (visible to near-infrared).
- Demonstrated efficiencies up to 75% in the 1.0 to 1.4 μm range.
- Successfully created chiral holograms projecting different images based on reference beam handedness.
Conclusions:
- Metasurface-based holograms offer versatile, high-performance imaging.
- The developed devices are compact, lightweight, and suitable for large-angle imaging.
- Significant potential for emerging applications, including wearable optics.
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