# Backward Propagation

arXiv: https://arxiv.org/abs/2004.07818 · HTML: https://mlsanity.com/paper/2004.07818/

## Key facts

- Cited by 1 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 15 Apr 2020.

## Built on by (most cited first, 1 of 1)

- [Deep Learning Algorithm for Advanced Level-3 Inverse-Modeling of Silicon-Carbide Power MOSFET Devices](https://mlsanity.com/paper/2310.17657/) (2023)

## Abstract (arXiv)

The document covers the fundamental algorithm of backward propagation from the point of view of reconstructing the wavefield captured by a "screen" in an imaging system. Owing to a property of the Helmholtz equation, wavefields have an inherent propagation symmetry which can be exploited for image formation. In traditional presentations of this topic the link between this "reciprocity" and the reconstruction procedure are motivated only at an intuitive level. I propose to make this more rigorous by using a technique called "plane-to-plane" propagation which is also known as "beam propagation method" in more advanced settings.