Algorithmic Discovery of Casimir-Polder forces: Repulsion in the Ground State

We present a general-purpose algorithm for automatic production of a structure that induces a desired Casimir-Polder force. As a demonstration of the capability and wide applicability of the method, we use it to develop a geometry that leads to a repulsive Casimir-Polder force on a ground-state atom. The results turn out to be reminiscent of the ring-like geometries previously used to induce repulsion, but with some new features and – importantly – discovered completely independently of any input from the user. This represents a powerful new paradigm in the study of atom-surface forces – instead of the user testing various geometries against a desired figure of merit, the goal can be specified and then an appropriate geometry created automatically.