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Inorganic Electrochromic Metasurface in the Visible
Yohan Lee1, Jonas Herbig1, Serkan Arslan1
14th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
Nano Letters
|April 24, 2025
Summary
Researchers developed electrochromic tungsten trioxide (WO3) cylindrical resonators for tunable structural colors. This technology enables active control of color intensity and purity, paving the way for advanced smart windows and display technologies.
Area of Science:
- Nanophotonics and Metasurfaces
- Materials Science and Engineering
Background:
- Structural color printing using nanostructures offers subwavelength resolution.
- Active control of structural colors with smart materials is crucial for real-world applications.
Purpose of the Study:
- To demonstrate tunable structural colors using tungsten trioxide (WO3) cylindrical resonators.
- To achieve a large color gamut with high intensity and purity, and enable on/off switching.
Main Methods:
- Fabrication of WO3 cylindrical resonators.
- Characterization of optical resonances in the visible spectrum.
- Application of alternating voltages (+2.0 V and -0.3 V) to induce electrochromism.
Main Results:
- Demonstrated a large color gamut with high intensity and purity.
- Achieved reversible switching of structural colors on and off using electrochromism.
- WO3 metasurfaces exhibited strong resonances in the visible spectral range.
Conclusions:
- Tungsten trioxide cylindrical resonators provide a viable platform for active structural color control.
- The electrochromic switching capability of WO3 opens possibilities for smart windows and novel display technologies.
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