Storage and calculation integrated photon calculation system based on phase change metasurface and holographic light field modulation

By utilizing the refractive index difference of phase change metasurfaces and holographic light field modulation, an in-memory photonic computing system is developed. This system achieves efficient large-scale neural network computing by taking advantage of the refractive index difference of phase change materials and the diffraction characteristics of light. It solves the problems of low storage density and limited modulation mechanism in existing photonic computing schemes and has extremely high computing power density and energy efficiency ratio.

CN121998011APending Publication Date: 2026-05-08HANGZHOU HUAWANG SYST TECH CO LTD
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Patent Information

Application Number
CN202610116786.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-28
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

Existing photonic computing schemes face problems such as low storage density, limited modulation mechanisms, and lack of nonlinear interactions, making it difficult to achieve efficient large-scale neural network computing.

Method used

An in-memory photonic computing system based on phase change metasurfaces and holographic light field modulation is adopted. It utilizes the difference in refractive index of phase change materials in crystalline and amorphous states, records the neural network weight matrix through holograms, and completes the calculation instantaneously using light diffraction. It also combines a photoelectric activation module to realize a nonlinear activation function.

Benefits of technology

It combines high-density optical storage with high-speed computing, eliminates weight transfer overhead, has extremely high computing power density and energy efficiency, and is low in cost and easy to expand.

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Abstract

The invention discloses a storage and calculation integrated photon calculation system and method based on a phase change metasurface and holographic light field modulation, and aims to solve the problems that storage and calculation are separated, the dynamic modulation speed is low and the precision is limited in an existing photon calculation framework. The invention provides a hybrid computing architecture which takes a blue-ray disc or a phase change storage wafer as a high-density holographic weight storage medium and is combined with a high-speed spatial light modulator and a photoelectric nonlinear activation circuit. Through an area array parallel reading mechanism, a large-scale weight matrix is read at one time by using beam-expanded coherent light, light velocity matrix multiplication is completed, and interlayer fast switching of the deep neural network is realized in combination with a streaming rotation or light beam scanning technology. According to the invention, the non-volatility and multistage refractive index characteristics of the phase change material are utilized to realize high-density on-chip storage and zero-power-consumption lossless reading of large model weight, and the problems of a video memory wall and an energy consumption wall in large model reasoning are effectively solved.
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