Scientists made 3D-printed lenses that turn sound into 'holograms' to literally remote-control specific neurons in your brain.
March 25, 2026
Original Paper
Bridging the numerical-physical gap in acoustic holography via end-to-end differentiable structural optimization
arXiv · 2603.23475
The Takeaway
While most brain stimulation requires invasive surgery or bulky magnets, this technique uses a custom-shaped 3D lens to warp simple sound waves into complex patterns that can reach through the skull. The researchers successfully used these 'sound holograms' to treat chronic pain in mice, proving that shaped sound can act as a high-precision, non-invasive medical tool for the brain.
From the abstract
Acoustic holography provides a practical means of flexibly controlling acoustic wavefronts. However, high-fidelity shaping of acoustic fields remains constrained by the numerical-physical gap inherent in conventional phase-only designs. These approaches realize a two-dimensional phase-delay profile as a three-dimensional thickness-varying lens, while neglecting wave-matter interactions arising from the lens structure. Here, we introduce an end-to-end, physics-aware differentiable structural opti