Outline:
You may believe that invisibility cloaks are only found in the Wizarding World, but reconsider. A group of researchers from the Korea Advanced Institute of Science and Technology (KAIST) has created a technology using liquid metal composite ink, capable of absorbing and blocking electromagnetic waves, thereby making objects invisible. The actual “invisibility cloak” is generating significant attention from the military.
How does it work?
According to the scientists’ research paper, the technology of the invisibility cloak functions by controlling electromagnetic waves—like radar and communication signals—so that they do not bounce back to a detector. It achieves this by employing a unique “metamaterial,” which is created to capture and alter waves in a specific manner.
The ink developed by the team forms the metamaterial as it dries. During this process, metal particles in the ink connect, forming a sort of mesh that interacts with electromagnetic waves, allowing objects to go undetected. The material that’s formed by the ink is both liquid-like in terms of flexibility and metal-like in terms of its durability.
True invisibility?
Even though the cloak does not hide objects from human vision (for now), it renders them undetectable by sensors, thermal cameras, radar, and radio waves. It significantly decreases or completely removes the object’s visibility. In military scenarios—where being detected is often more critical than being seen directly—this form of invisibility can be far more advantageous.
Liquid metal ink
The KAIST cloak is not the initial one of its kind; it emerged from earlier research, where 3D silver structures were embedded in hydrogel, although the silver structure was excessively stiff. What distinguishes the KAIST cloak is its adaptability.
Employing liquid metal rather than a solid metal framework not only simplifies the process of filling the hydrogel microchannel but also enhances its flexibility,said Tao Chenoriginating from Xi’an Jiaotong University in China.
The ink created by KAIST retains its electrical functionality even when extended beyond ten times its initial size. This allows it to function on uneven surfaces, dynamic machinery, and in wearable technologies.
Where can it be applied?
“This innovation is anticipated to be applied in numerous upcoming technologies, including robotic skin, wearable devices attached to the body, and radar stealth systems within the defense industry,” lead researcher Hyoungsoo Kimsaid in a statement.
The military implications are considerable. Vehicles covered with these materials might be more challenging to detect by enemy radar, surveillance drones could function with a lower chance of being identified, soldiers could transport gear or wear clothing that reduces their electromagnetic signature, and even complete military infrastructure could be protected.
A matter of time
Although the advancement is evident, it’s crucial to manage expectations since it is still far from being put into practice. Issues related to scaling, manufacturing, and maintaining reliability in harsh conditions remain. Nevertheless, while a genuineHarry Potter– a cloak like in fantasy is now becoming a reality, with the capability to remain hidden from the digital surveillance of modern warfare, and the boundary between science fiction and science fact is becoming increasingly blurred.