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中国物理学会期刊

基于神经网络与差分进化协同优化的手性超表面逆向设计

Inverse Design of Chiral Metasurfaces Based on Collaborative Optimization of Neural Networks and Differential Evolution

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  • 基于连续域束缚态的手性超表面为实现高性能手性光学器件提供了重要途径,但传统设计方法通常依赖于复杂的参数扫描,存在灵活性不足、易陷入局部最优等局限,难以实现最优的手性光学响应。本研究提出一种结合神经网络与差分进化算法的混合逆向设计策略,用于1200—1500nm波长范围内高效、精准地设计具有指定圆二色性(CD)响应的手性超表面。该模型是由峰值预测器与谱线预测器组成的双阶段神经网络构成的,实现从结构参数到手性光学响应的高精度、跨维度映射,可准确捕捉CD谱线的关键特征。在神经网络正向预测模型的基础上,再利用差分进化算法的全局搜索能力,通过设定的CD目标值逆向预测得到最优结构参数组合。本研究突破了传统设计方法的瓶颈,为实现高灵敏度手性传感应用提供了新的设计路径,也为其他纳米光子器件的逆向设计提供了参考。

     

    Chiral metasurfaces based on bound states in the continuum provide an important way to develop high-performance chiral optical devices. However, traditional design methods usually rely on complicated parameter scanning, which are limited by insufficient flexibility and easy trapping into local optima, and thus hardly achieve the optimal chiral optical response.This study adopts the double scythe-shaped (DSS) structure and proposes a hybrid inverse design strategy combining neural network and differential evolution algorithm (DE). It can efficiently and accurately design chiral metasurfaces with designated circular dichroism (CD) responses in the wavelength range of 1200—1500 nm.This model consists of a peak predictor and a spectrum predictor, which realizes high-precision and cross-dimensional mapping from structural parameters to chiral optical responses. It can accurately capture the key characteristics of CD spectra and exhibits excellent spectral prediction capability. On this basis, leveraging the global search ability of the DE algorithm, the optimal combination of structural parameters is inversely predicted driven by the target CD value.Experimental results show that the coefficient of determination (R2) of the two-stage neural network for structural parameter prediction exceeds 0.9899, and the R2 values for wavelength and CD prediction are 0.8721 and 0.7631, respectively. The model can accurately restore the core characteristics of circular dichroism spectra and effectively address the strong nonlinear mapping problem between structural parameters and optical responses. The proposed model only requires 350 groups of simulation data for training, which is far less than the thousands of datasets required by existing deep learning methods.Compared with the existing inverse design methods, the proposed strategy achieves a higher CD value (≈0.9) and exhibits obvious advantages in both efficiency and performance.This study gives full play to the fast surrogate prediction advantage of neural networks and the global optimization capability of differential evolution algorithm. It breaks through the technical bottlenecks of traditional chiral metasurface design, opens up a new technical route for high-sensitivity chiral sensing applications, and provides a reference for the inverse design of other nanophotonic devices.

     

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