Light-driven ‘metajets’ hint at a new way to steer microscopic flight

A propulsion concept built on light rather than fuel

Researchers at Texas A&M University are advancing an idea that sounds like science fiction but rests on a familiar physical principle: light carries momentum, which means it can push on matter. In a newly reported experiment, the team says it used that pressure to lift and steer microscopic devices using only laser illumination, without motors, fuel or physical contact.

The work centers on structures the researchers call “metajets,” tiny devices built from metasurfaces. These are ultrathin materials patterned with nanoscale features that can redirect incoming light in carefully controlled ways. When light is bent or scattered, momentum is transferred, creating an equal and opposite force on the object itself. In effect, the structure turns the geometry of its surface into a steering and propulsion mechanism.

The findings were reported as having been published in Newton. While the experiment took place at microscopic scale, the researchers argue that the same underlying physics could eventually inform advanced forms of spacecraft propulsion. That is the long-range vision behind the work, though the immediate achievement is far more modest and more concrete: controlled movement of tiny objects by light alone.

Why control is the real challenge

The notion of light propulsion is not new. Scientists have understood radiation pressure for more than a century, and agencies including NASA and JAXA have already flown solar-sail spacecraft that use sunlight for gentle, continuous thrust. The hard problem has never been simply generating force. It has been generating force while preserving stability and directional control.

That challenge becomes much more severe at high speed or over long distances. A light-propelled craft that cannot be steered or stabilized would be of limited use. Even slight deviations could compound dramatically during interplanetary or interstellar travel. The promise of metajets is that they might provide a way to shape both thrust and control through engineered optical response rather than mechanical systems or onboard propellant.

According to the description of the work, the researchers successfully lifted and steered the tiny devices in multiple directions. That multi-directional maneuvering is what distinguishes the experiment from a simpler push. It suggests that the surface pattern can be designed to create tailored force responses under illumination, making the device not just movable but controllable.

From microdevices to deep-space speculation

The leap from microscopic demonstrations to future spacecraft remains large. The article’s interstellar framing is explicitly aspirational, not operational. No one should confuse a lab-scale result with a near-term transportation system. Still, early-stage propulsion research often matters because it expands the range of physically plausible control methods available to future engineers.

There is also a nearer-term technological implication. If metasurface-based light control can produce predictable forces on tiny objects, the concept may have applications beyond spacecraft. Micromanufacturing, optically guided robotics and contactless manipulation are all areas where precise movement at small scales is valuable. Even if the spaceflight vision remains distant, the optical engineering itself could find more immediate use.

The experiment underscores how much modern materials science depends on structure rather than composition alone. Metasurfaces work because their patterned geometry manipulates electromagnetic waves in ways bulk materials cannot. That design freedom is turning surfaces into active optical tools, capable of filtering, focusing, redirecting and now, potentially, propelling.

For the space sector, the attraction is obvious. Every propulsion system is constrained by the mass it must carry, especially fuel. A method that relies on externally supplied light rather than onboard propellant promises a radically different mass equation. Solar sails already point in that direction; metajets suggest a path toward finer steering and potentially more responsive control.

The important caveat is scale. Radiation pressure is weak, and making it useful requires either long durations, intense light, tiny masses or all three. That is why the present work focuses on microscopic structures under laser illumination. Translating those effects into larger systems would demand major advances in materials, beam control and mission architecture.

Even so, the result is worth watching because it reframes a classic concept through a modern materials platform. Instead of treating light pressure as a blunt instrument, the metajet approach treats it as something programmable. If that principle continues to hold up experimentally, it could open a new class of optical motion systems whose first successes happen in the lab and whose most ambitious applications remain out in deep space.

This article is based on reporting by New Atlas. Read the original article.