# Compact single-shot ranging and near-far imaging using metasurfaces

arXiv: https://arxiv.org/abs/2604.10037 · HTML: https://mlsanity.com/paper/2604.10037/

## Key facts

- No citing papers in the map yet (data through 14 Oct 2026).
- Builds on 4 of its 25 references that are in the map.
- First posted on arXiv 11 Apr 2026.

## Builds on (most cited first, 4 of 4)

- [Polarization Multi-Image Synthesis with Birefringent Metasurfaces](https://mlsanity.com/paper/2307.08106/) (2023)
- [Focal Split: Untethered Snapshot Depth from Differential Defocus](https://mlsanity.com/paper/2504.11202/) (2025)
- [MetaH2: A Snapshot Metasurface HDR Hyperspectral Camera](https://mlsanity.com/paper/2507.08282/) (2025)
- [MetaSpectra+: A Compact Broadband Metasurface Camera for Snapshot Hyperspectral+ Imaging](https://mlsanity.com/paper/2603.09116/) (2026)

## Abstract (arXiv)

We present a metasurface imaging system capable of simultaneously capturing two images at close range (1-2~cm) and an additional image at long range (about 40~cm) on a shared photosensor. The close-range image pair focuses at 1.4~cm and 2.0~cm, respectively, which forms a focal stack, enabling passive ranging with an accuracy of ±1~mm from 12~mm to 20~mm through a computationally efficient depth-from-defocus algorithm for a simplified scenario. The entire system is compact, with a total track length of 15~mm, making it suitable for seamless integration into edge platforms for defense and other resource-constrained applications.