Fig. 1. Illustration of our approach and the loss curve of the neural network. (a) Sketch of a scatterer and its far-field pattern. (b) Loss curve of our neural network.

Fig. 2. Examples of results from our method on: (a) random structures from the test set; and (b) typical shapes with different sizes, compared to the ground truth.

Fig. 3. Two examples of calculating a far-field pattern using our web tool. (a), (b) Two steps of drawing the final structure, which is the one on the right side in Fig. 2(a) and the related far-field pattern after each drawing stroke. (c), (d) Corresponding to the structures in Fig. 2(b). We also provide a video to show the design process online.