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Updated: May 26, 2026

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Electro-optic Modulation in Polycrystalline Barium Titanate Metasurfaces Enhanced by Poling.

Eleni Prountzou¹, Helena C Weigand¹, Virginia Falcone¹

¹ETH Zurich, Department of Physics, Institute for Quantum Electronics, Optical Nanomaterial Group, Zurich 8093, Switzerland.

|May 25, 2026

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Researchers developed new barium titanate (BaTiO3) metasurfaces for optical modulators. These imprinted metasurfaces achieve enhanced modulation strength at low voltages, paving the way for efficient, reconfigurable optical devices.

Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Electrically tunable metasurfaces are crucial for reconfigurable free-space optical devices.
Barium titanate (BaTiO3) exhibits a strong Pockels effect, making it suitable for such applications.
Limitations of epitaxial BaTiO3 films include high cost, poor scalability, and substrate incompatibility.

Purpose of the Study:

To demonstrate free-space optical modulators using imprinted BaTiO3 metasurfaces.
To enhance optical and electric field confinement within the active material.
To achieve improved modulation performance at low driving voltages and high frequencies.

Main Methods:

Fabrication of imprinted BaTiO3 metasurfaces with targeted designs.
Characterization of optical resonances with high quality factors (up to 200).

Keywords:

barium titanate electro-optic modulation metasurface nanoimprint poling tunable

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Ferroelectric domain alignment to enhance the electro-optic (EO) response.

Main Results:

Demonstrated improved transmission modulation at sub-volt driving amplitudes and up to 5 MHz frequencies.
Achieved up to 25% higher modulation strength via ferroelectric domain alignment compared to the unbiased case.
Showcased up to 75% improvement in modulation strength compared to previous demonstrations.

Conclusions:

Imprinted BaTiO3 metasurfaces offer a scalable and cost-effective alternative to epitaxial films.
Effective permittivity engineering and domain orientation enhance EO response in polycrystalline metasurfaces.
These findings hold significant potential for developing scalable and efficient electro-optic modulators and active metasurfaces.