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Ultrafast Optically Tunable GaAs Metasurfaces for Analog Image Processing
Vyacheslav V Yushkov1, Alexander S Shorokhov1, Andrey A Fedyanin1
1Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
ACS Omega
|January 26, 2026
Summary
Researchers developed a tunable gallium arsenide metasurface for ultrafast optical processing. This compact device achieves subpicosecond switching, enabling real-time functions for edge computing and advanced imaging.
Area of Science:
- Photonics and Nanotechnology
- Optoelectronics
- Materials Science
Background:
- Optical metasurfaces enable miniaturization of bulk optics for edge computing.
- Current metasurfaces lack dynamic tunability for real-time optical processing.
- Ultrafast modulation is crucial for advanced optical functions.
Purpose of the Study:
- To numerically demonstrate a tunable gallium arsenide (GaAs) metasurface.
- To achieve subpicosecond switching between dual complex-valued transfer functions.
- To enable real-time optical processing for edge computing applications.
Main Methods:
- Numerical simulation of a GaAs metasurface.
- Utilizing Mie-resonant nanoantennas for optical modulation.
- Employing ultrafast photoinduced carrier modulation with pump pulses (4.8 nJ).
Main Results:
- Demonstrated subpicosecond switching between dual complex-valued transfer functions.
- Achieved nonuniform amplitude and phase profile modulation.
- Enabled real-time Fourier filtering with switching frequency >100 GHz.
Conclusions:
- The developed metasurface offers dynamic tunability for optical processing.
- This technology paves the way for ultrafast neuromorphic vision sensors.
- Potential applications include live image processing and advanced edge computing.
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