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Subvolt high-speed free-space modulator with electro-optic metasurface.

Go Soma¹, Koto Ariu², Seidai Karakida²

¹School of Engineering, The University of Tokyo, Tokyo, Japan. go.soma@tlab.t.u-tokyo.ac.jp.

Nature Nanotechnology

|September 10, 2025

Summary

This summary is machine-generated.

Researchers developed low-voltage, high-speed optical modulators using silicon-organic-hybrid metasurfaces. These devices achieve efficient modulation at significantly reduced driving voltages, enabling practical, energy-efficient applications in optical communication and computing.

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Last Updated: Jan 18, 2026

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Area of Science:

Photonics and Nanotechnology
Materials Science
Electrical Engineering

Background:

Active metasurfaces with electro-optic materials are key for high-speed free-space optical modulators.
Current metasurface designs often require high driving voltages (tens of volts) due to limited light-matter interaction, hindering practical applications.

Purpose of the Study:

To present novel low-voltage, high-speed free-space optical modulators.
To demonstrate efficient modulation using silicon-organic-hybrid metasurfaces with optimized nanostructures.

Main Methods:

Fabrication of silicon-organic-hybrid metasurfaces featuring dimerized-grating nanostructures.
Exploitation of a high-quality factor (Q) resonant mode to enhance light-matter interaction.
Integration of organic electro-optic materials within submicrometre silicon slot regions.

Main Results:

Achieved highly efficient optical modulation at low driving voltages (0.2 V and 1 V).
Demonstrated high-speed data transmission at 50 Mbps and 1.6 Gbps.
Enabled operation at complementary metal-oxide-semiconductor (CMOS)-compatible voltage levels.

Conclusions:

The developed metasurface modulators offer a significant reduction in driving voltage requirements.
These low-voltage modulators pave the way for energy-efficient, high-speed practical applications of active metasurfaces.
The technology is compatible with existing semiconductor manufacturing processes, facilitating integration.