The application discloses a kind of based on
deep learning's reflective metasurface phase prediction method.The method includes: using 16×16 discrete coding
symmetric structure to construct metasurface unit, improve the
design space of metasurface, and generate the
data set including structure image and corresponding reflection phase real part and imaginary part curve by Python-CST
joint simulation;A kind of
hybrid neural
network model is constructed by local
feature extraction module, global
feature modeling module and regression output module, wherein local
feature extraction is realized based on ResNet, and global
feature modeling is completed by introducing position coding and frequency coding
Transformer encoder;While designing the complex
loss function including phase real part error, imaginary part error and physical constraint term, and the
weight coefficient thereof is systematically optimized to balance prediction accuracy and physical rationality;Optimized
loss function and set
hyperparameter are used to
train the network;Finally, the trained model is used to realize the rapid phase prediction of new metasurface structure.The application effectively solves the problems of
phase jump processing difficulty in high degree of freedom metasurface design, and the lack of local and global feature collaborative modeling, realizes the rapid, high-precision and physically reasonable prediction of reflection phase in wide
frequency band.