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Related Experiment Video

Updated: Jun 5, 2025

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Published on: September 25, 2020

Thermally tunable binary-phase VO₂ metasurfaces for switchable holography and digital encryption.

Yuan Liao¹, Yulong Fan^1,2, Dangyuan Lei¹

¹Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, China.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

This study introduces a thermally tunable metasurface using vanadium dioxide (VO2) nanofins for dynamic holographic displays. This innovation enables high-quality visible holograms that change with temperature, offering new possibilities for optical encryption and anti-counterfeiting technologies.

Keywords:

information encryption machine learning optimization metasurface holography tunable metasurface vanadium dioxide

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Area of Science:

Optics and Photonics
Materials Science
Nanotechnology

Background:

Metasurface holography utilizes nanostructures for high-quality, wide-angle holographic images.
Dynamic tuning of metasurface holography in the visible spectrum remains a challenge due to limited tuning mechanisms.

Purpose of the Study:

To propose and demonstrate a thermally tunable metasurface for visible holographic applications.
To leverage the phase transition of vanadium dioxide (VO2) for dynamic holographic image generation and information encoding.

Main Methods:

Design of a binary-phase metasurface composed of vanadium dioxide (VO2) nanofins.
Utilizing machine learning to encode two independent holograms based on VO2's phase states (insulator-to-metal transition).
Numerical demonstration of temperature-controlled holographic image reconstruction under chiral illumination.

Main Results:

Successful generation of distinct, high-quality binary-phase holograms by controlling VO2 nanofin temperature.
Demonstration of temperature-dependent image reconstruction, with optimal performance under specific chiral illumination.
Validation of the metasurface for high-security digital encryption, distinguishing between correct and fraudulent messages via temperature and excitation control.

Conclusions:

The proposed VO2-based tunable metasurface provides an efficient method for dynamic holographic displays in the visible band.
This approach offers significant potential for applications in dynamic displays, information encryption, and optical anti-counterfeiting.