Light becomes a tool for propulsion itself, where energy and control are one
In a laboratory at Texas A&M University, researchers have crossed a threshold long imagined but never demonstrated: using light alone to lift and steer objects freely through three-dimensional space. The devices are microscopic, but the physics they embody is indifferent to scale — and that indifference carries within it the distant possibility of starships propelled not by fuel, but by light itself. Humanity has long measured the stars in terms of impossibility; this work begins, quietly, to renegotiate those terms.
- For the first time, researchers have achieved full 3D control of tiny metajet devices using only laser light — a milestone no laboratory had reached before using this approach.
- The tension lies in the gap between the microscopic and the cosmic: the same physics that nudges an object smaller than a human hair could, in principle, drive a spacecraft to another star.
- Rather than sculpting the laser beam itself, the team embedded the steering logic directly into the material's surface — a strategic inversion that unlocks control previous methods could not achieve.
- The nearest star system, Alpha Centauri, sits hundreds of thousands of years away by conventional rocket; light-driven propulsion at sufficient power could compress that journey to roughly twenty years.
- The path forward runs through microgravity: the team is now pursuing funding to test metajets beyond Earth's gravity, moving the concept from fluid-bath laboratory curiosity toward genuine spaceflight conditions.
Inside a Texas A&M laboratory, researchers have done something that once belonged only to speculation: they used lasers to lift and steer tiny objects through all three dimensions of space, without ever touching them. The devices — called metajets — are smaller than a human hair, but the physics animating their motion carries implications that stretch across interstellar distances.
Metajets are built from metasurfaces, ultrathin materials engineered with nanoscale precision to reshape how light behaves. When a laser strikes one, the surface doesn't simply reflect or absorb the light — it redirects the light's momentum into the device itself, generating a controlled, measurable force. Team leader Shoufeng Lan likens each photon to a ping pong ball: small individually, but collectively capable of producing real motion.
What distinguishes this work is where the control lives. Earlier optical propulsion systems tried to shape the laser beam with enough complexity to steer objects. The Texas A&M team instead built the steering directly into the material — a fundamental shift in strategy that enabled three-dimensional maneuvering for what Lan believes is the first time using this approach, placing their work alongside related efforts at Caltech and the Rochester Institute of Technology.
The stakes of scaling this technology are difficult to overstate. A conventional rocket would take hundreds of thousands of years to reach Alpha Centauri. A light-driven spacecraft, supplied with sufficient laser power, might make the same journey in around twenty years. Crucially, the force light generates depends on intensity, not device size — meaning the principles governing a microscopic metajet could, in theory, govern a spacecraft.
Fabricating the metasurfaces required nanoscale precision at every step, carried out at Texas A&M's AggieFab facility. Experiments were conducted in fluid to counteract gravity and clarify the motion. The team's next challenge is testing in microgravity, where propulsion can be studied under conditions closer to actual spaceflight — work that awaits external funding.
For now, the metajets remain invisible to the naked eye, their journeys measurable only under magnification. But the framework Lan's team has built points toward a future where light is not merely a tool for seeing, but for moving — where the energy source and the means of navigation are one, and where the distance to the stars begins, however slowly, to feel less absolute.
In a laboratory at Texas A&M University, researchers have achieved something that seemed to belong firmly in the realm of speculation: they have used lasers to lift and steer objects through space without touching them, controlling their movement in all three dimensions. The objects are impossibly small—tens of microns across, smaller than a human hair—but the physics underlying their motion could one day propel spacecraft across the vast distances between stars.
These devices, called metajets, are built from metasurfaces: ultrathin engineered materials patterned with structures so precise they reshape how light behaves. When a laser beam strikes a metajet, the light does not simply pass through or bounce off randomly. Instead, the carefully designed surface transfers the light's momentum to the device itself, creating a measurable force that pushes it in a controlled direction. Shoufeng Lan, an assistant professor in the mechanical engineering department and director of the Lab for Advanced Nanophotonics, compares the effect to ping pong balls striking a wall—each photon carries momentum, and when it reflects, that momentum becomes motion.
What makes this breakthrough distinct is the three-dimensional control. Previous optical propulsion systems could move objects in limited ways, constrained by the complexity of shaping light beams precisely enough. The Texas A&M team took a different approach: instead of trying to sculpt the laser itself, they built the control mechanism into the material. This shift in strategy opens possibilities that earlier methods could not reach. To Lan's knowledge, this is the first time researchers have demonstrated full 3D maneuvering using this particular approach, though related work has emerged from laboratories in Europe and elsewhere in the United States, including efforts at Caltech and Rochester Institute of Technology.
The implications extend far beyond the laboratory. A journey to Alpha Centauri, the nearest star system to Earth, would require hundreds of thousands of years using conventional rocket propulsion. But if this light-driven approach could be scaled up and supplied with sufficient optical power, the same trip might take only about twenty years. The physics suggests such scaling is possible: the force generated depends on the intensity of the light, not the size of the device. In principle, the same principles that move a device smaller than a hair could move a spacecraft, if the laser power were strong enough.
Fabrication of these metasurfaces demanded extraordinary precision. Each feature—its shape, orientation, and placement—had to be engineered at the nanoscale. The team produced their devices at the Texas A&M AggieFab Nanofabrication Facility, using equipment and expertise developed over years of work in advanced materials. To test the metajets, researchers conducted experiments in a fluid environment, which helped counteract gravity and allowed them to observe the motion more clearly. The next phase of research will require moving beyond these laboratory conditions. The team is now seeking external funding to conduct tests in microgravity environments, where the effects of light-driven propulsion could be studied without gravity's interference, bringing the concept closer to the conditions spacecraft would actually encounter.
The work represents a convergence of fundamental physics and practical engineering. It demonstrates not just that light can move objects—that has been known for decades—but that light can be harnessed with enough precision and control to steer them in any direction, at scales both tiny and potentially vast. For now, the metajets remain microscopic curiosities, their motion visible only under magnification. But the framework Lan and his team have developed suggests a future where light becomes a tool for propulsion itself, where the energy source and the means of control are one and the same, and where the distances between worlds might shrink from the impossible to the merely difficult.
Notable Quotes
The force depends on the power of the light rather than the size of the device, meaning the same principles could apply beyond microscopic systems.— Shoufeng Lan, Texas A&M University
The Hearth Conversation Another angle on the story
So these metajets are being steered by light bouncing off them. How is that different from just using a laser pointer to push something?
The difference is in the precision and the material itself. A regular laser beam spreads out and loses focus. These metasurfaces are engineered so that every part of the surface is designed to redirect light in a specific way—it's like having millions of tiny mirrors arranged in a pattern that controls exactly how momentum gets transferred.
And that's why they can move in three dimensions?
Exactly. By changing which part of the metajet the laser hits, or by adjusting the laser's properties, you can push the object in different directions. It's not just up or down—it's full control, like steering a ship.
The article mentions this could scale up to spacecraft. But these things are smaller than a hair. How do you get from that to something you could actually ride in?
The key insight is that the force depends on how much light power you're using, not on the size of the object. So theoretically, if you had a powerful enough laser—and we're talking about lasers far beyond what exists now—you could apply the same principle to something much larger.
That sounds like science fiction.
It does. But what's interesting is that the physics isn't speculative. The team has demonstrated the principle works. The engineering challenge is just making the lasers powerful enough and figuring out how to sustain that kind of propulsion over the distances involved in space travel.
Why does testing in microgravity matter if the physics is already proven?
Because on Earth, gravity is always fighting you. In the lab, they use fluid to help cancel it out, but that's not realistic. In actual space, there's no gravity to fight, no fluid to move through. Testing in microgravity would show how the metajets perform in conditions that actually matter for spacecraft.