MIT's New Lidar Chip Gives Autonomous Vehicles a Wider, Clearer View

Engineers solve a decade-old antenna interference problem with an elegant silicon-photonics design.

Lidar — the laser-based sensing technology that helps autonomous vehicles, drones, and robots see the world — has long faced a trade-off between field of view and mechanical durability. Conventional lidar sensors rely on rotating components to scan their surroundings, which adds bulk and introduces wear points over time. Chip-based solid-state lidar eliminates the moving parts, but until now, it has been limited to a narrow viewing angle. MIT researchers have just removed that limitation with a clever optical design published in Nature Communications.

How the New Chip Works

The key innovation lies in the antenna array. Traditional silicon-photonics lidar chips pack antennas closely together to steer a laser beam electronically, but neighboring antennas inevitably interfere with each other — a phenomenon called crosstalk. Engineers previously tried to reduce crosstalk by spacing antennas farther apart, but that created multiple ghost beams at different angles, effectively shrinking the usable field of view. The MIT team, led by Professor Jelena Notaros, designed antennas with differently shaped corrugation patterns that sit close together without scrambling each other's signals. This suppresses crosstalk at its source while preserving a single, clean steerable beam.

Three Key Facts

• No moving parts: The chip uses an integrated optical phased array (OPA) to steer light electronically, eliminating the rotating mirror assemblies found in conventional lidar systems. This makes the sensor smaller, lighter, and more durable.
• Broad scan range: By solving the antenna spacing problem, the chip achieves a significantly wider field of view than previous solid-state designs, enabling autonomous vehicles to detect objects at the edges of their path without mechanical scanning.
• Silicon-photonics platform: The chip is fabricated using standard CMOS-compatible processes, which means it can be mass-produced at low cost using existing semiconductor manufacturing infrastructure.

Real-World Applications

The breakthrough could accelerate the deployment of solid-state lidar in autonomous vehicles, aerial drones for mapping and surveying, and industrial monitoring systems for construction sites and warehouses. Because the sensor has no moving parts, it is inherently more reliable over long operational lifetimes — a critical requirement for commercial autonomous fleets. The MIT team's approach also opens the door to integrating lidar directly onto electronic chips, potentially shrinking the entire sensing system to the size of a fingernail.