FieldSeer I: Physics-Guided World Models for Long-Horizon Electromagnetic Dynamics under Partial Observability
This work addresses the challenge of long-horizon electromagnetic dynamics under partial observability for photonic design, offering a practical path toward interactive digital twins, though it is incremental as it builds on existing world model concepts with geometry conditioning.
The paper tackles the problem of forecasting electromagnetic field dynamics from partial observations in 2-D TE waveguides by introducing FieldSeer I, a geometry-aware world model that achieves higher suffix fidelity than GRU and deterministic baselines across three practical settings, such as 64x64 software-in-the-loop filtering and 80x140 offline rollouts.
We introduce FieldSeer I, a geometry-aware world model that forecasts electromagnetic field dynamics from partial observations in 2-D TE waveguides. The model assimilates a short prefix of observed fields, conditions on a scalar source action and structure/material map, and generates closed-loop rollouts in the physical domain. Training in a symmetric-log domain ensures numerical stability. Evaluated on a reproducible FDTD benchmark (200 unique simulations, structure-wise split), FieldSeer I achieves higher suffix fidelity than GRU and deterministic baselines across three practical settings: (i) software-in-the-loop filtering (64x64, P=80->Q=80), (ii) offline single-file rollouts (80x140, P=240->Q=40), and (iii) offline multi-structure rollouts (80x140, P=180->Q=100). Crucially, it enables edit-after-prefix geometry modifications without re-assimilation. Results demonstrate that geometry-conditioned world models provide a practical path toward interactive digital twins for photonic design.