Silicon Metasurface Replaces Bulky Projectors for Compact Structured-Light 3D Imaging
ssh4net · x · 2026-10-22
Researchers Gengyuan Ye and Shuming Wang demonstrate a compact structured-light 3D imaging platform built on a silicon dielectric metasurface operating at 940 nm near-infrared.
- Conventional structured-light systems rely on bulky projection optics like digital micromirror devices and diffractive elements, limiting miniaturization.
- A Gerchberg-Saxton (GS) phase optimization algorithm encodes sinusoidal fringe illumination directly into the metasurface, eliminating projection components.
- The design uses silicon nanopillars on sapphire (period 370 nm, height 500 nm), with unit-cell size tuned to achieve a full 0-2π phase shift.
- FDTD simulations confirm the target far-field fringe pattern, and 3D reconstruction of a test object is demonstrated.
The approach targets machine vision, robotics, and computational sensing, offering a path toward highly integrated 3D imaging systems.
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