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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.
Abstract:
Optical metasurfaces offer unprecedented potential for miniaturizing conventional bulk optics into compact, energy-efficient devices suitable for advanced edge computing applications. However, current implementations lack the dynamic tunability essential for real-time optical processing functions. Here, we numerically demonstrate a gallium arsenide metasurface that achieves subpicosecond switching between dual complex-valued transfer functions through ultrafast photoinduced carrier modulation. Our device exploits specially designed Mie-resonant nanoantennas for nonuniform amplitude and phase profile change under pump pulses with typical energies about 4.8 nJ. The metasurface enables real-time Fourier filtering with switching frequency exceeding 100 GHz, providing a pathway to ultrafast neuromorphic vision sensors and live image processing applications.
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