We describe an LSTM-based autoencoder for inversely designing an achromatic metalens comprised of cylindrical unit cells. The training data for our model has phase and transmission values corresponding to the heights and radii of each meta-unit. We use multiple data sequences (phase and transmission) to train the model and a multi-output model framework. The autoencoder is trained for 2500 iterations using the Adam optimizer with a learning rate of 0.001 and is subsequently used for inversely predicting the meta-unit dimensions at each radial position of the lens. Our model is validated via simulations as well as experiments.
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