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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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A 3D-Printed ‘Invisibility Cloak’ Could Make Objects Disappear From Infrared Cameras

Imagine a device that can make an object appear to vanish—not from the human eye, but from an infrared camera.

Researchers have developed a new 3D-printed thermal “invisibility cloak” that can hide objects from infrared sensors by controlling the way heat moves around them. Unlike earlier designs that worked only from certain directions or under limited conditions, the new device is designed to work around complex three-dimensional objects and from virtually any viewing direction.

The breakthrough could open new possibilities in thermal management, electronics, sensing technology, and even defense.

How can an object disappear from an infrared camera?

Infrared cameras do not see objects in the same way our eyes do. Instead, they detect infrared radiation associated with temperature. A warm person, vehicle, drone, or electronic device therefore produces a recognizable thermal signature.

The researchers wanted to solve a difficult problem: instead of simply blocking this heat, could they make the heat flow around an object so naturally that an infrared camera would not notice that the object was there?

Their answer is a specially engineered three-dimensional structure.

Shelly Zhang, a civil and environmental engineering professor at the University of Illinois Urbana-Champaign, explained that a genuine thermal cloak needs to work regardless of where heat originates. According to the research team, their device can conceal complex 3D objects from an enormous range of directions while keeping the temperature inside the protected region stable.

A new approach to controlling heat

Previous thermal-cloaking technologies had important limitations. Some were designed mainly for two-dimensional situations, while others worked only when viewed from a particular angle.

The new design takes a different approach.

Rather than trying to stop heat, the cloak redirects it around the hidden object. The idea is similar to water flowing around a smooth rock in a stream. Instead of crashing into the rock, the water separates, flows around it, and comes together again downstream.

In the same way, heat encountering the cloak is guided around its protected region. Once the heat passes the object, the temperature field reconnects in a way that makes the surrounding environment appear almost undisturbed.

For an infrared camera, there may be no obvious thermal pattern revealing that an object is hidden inside.

A high-tech 3D-printed structure

Creating this effect required more than simply selecting a special material.

The researchers returned to the fundamental mathematics of heat transfer to determine how thermal conductivity should vary throughout the cloak. They then translated those calculations into a physical structure.

The result is a complex lattice that resembles a high-tech honeycomb.

The device combines two different materials with very different thermal properties. Its outer framework is a 3D-printed aluminum lattice, chosen for its ability to conduct heat efficiently. The lattice is then filled through mold casting with a rubber-like material that has relatively low thermal conductivity.

By changing the dimensions of different parts of the lattice in three dimensions, the researchers were able to precisely control how heat moved through localized regions of the cloak.

This carefully engineered structure allows heat to follow a predetermined path around the protected object.

The object stays protected inside

The cloak does more than hide an object from an infrared camera.

According to the researchers, testing showed that the interior of the cloaked region could remain at a relatively stable and safe temperature even when the device was exposed to strong temperature differences.

This is an important feature because the technology is not simply creating an optical illusion. It is physically manipulating the movement of thermal energy.

During experiments, the researchers exposed the material to extreme temperature gradients and used infrared imaging to observe how heat moved through the structure.

From outside, the resulting temperature field could look as though the hidden object was not there.

The team also demonstrated the concept with highly irregular three-dimensional shapes, including a detailed model of a human head. This showed that the technology was not limited to simple geometric objects.

Could this really end thermal detection?

The technology is impressive, but it does not mean infrared cameras are becoming useless.

Instead, the research demonstrates a new method for controlling the thermal information that reaches a sensor.

Objects such as people, drones, vehicles, and overheated electronics can normally be detected because their temperatures differ from their surroundings. That difference creates a thermal signature.

A thermal cloak could potentially reduce or manipulate that signature by controlling the heat flowing around the object.

This could make thermal detection considerably more difficult in situations where the cloak is appropriately designed and deployed.

However, practical applications will depend on factors such as the object's size, its own internal heat production, environmental conditions, and the ability to manufacture the required structures.

Potential applications are enormous

One of the most interesting applications may actually be far away from military technology.

Modern electronics are becoming smaller and more powerful, creating increasingly serious heat-management problems. Hotspots inside microchips can damage sensitive components and reduce performance.

A structure based on the same principles could potentially route unwanted heat away from vulnerable parts of electronic systems, helping control temperatures more precisely.

The technology could also have applications in thermal insulation, aerospace systems, sensors, industrial equipment, and other areas where controlling heat is important.

Defense is another obvious area of interest.

Military vehicles, drones, and personnel can produce strong infrared signatures that may be detected by thermal imaging systems. A technology capable of reducing or redirecting those signatures could potentially make certain objects harder to identify using thermal surveillance.

But such applications remain a future possibility rather than an established operational capability.

The next generation could be “smart”

The researchers are already looking beyond the current design.

Their next goal is to develop smart thermal cloaks capable of responding dynamically to changing conditions.

Such a material could potentially detect heat generated by an object inside it and automatically adjust how that energy is distributed or dissipated.

That would represent a major step beyond a passive cloak. Instead of having a fixed thermal behavior, the material could actively respond to its environment.

The idea could eventually lead to advanced thermal systems that not only hide heat signatures but also protect sensitive objects from dangerous temperature changes.

More than hiding objects

The researchers say the broader significance of the work goes beyond invisibility.

Heat carries information. An infrared camera can use that information to determine where objects are, how hot they are, and how their temperatures change.

By controlling the movement of heat, the new cloak effectively controls some of the information available to a thermal sensor.

The research was an international collaboration involving the University of Illinois Urbana-Champaign and the Technical University of Denmark (DTU). The findings were published in the journal Nature Communications.

The concept may sound like science fiction, but the underlying technology is firmly rooted in heat-transfer mathematics, advanced materials, and 3D printing.

For now, the “invisibility cloak” is a research prototype. But it demonstrates something remarkable: with the right structure, heat itself can be guided around an object so precisely that the object can appear to disappear from an infrared view.

And as researchers develop smarter and more adaptable versions, controlling what thermal cameras can—and cannot—see could become an important technology of the future.

Reference: Li, W., Wang, Y., Sigmund, O. et al. Free-form thermal cloaks in three dimensions. Nat Commun 17, 5739 (2026). https://doi.org/10.1038/s41467-026-73167-0

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