A team of researchers from Shanghai Jiao Tong University has found that the human hand can be used as a power-free source of infrared (IR) radiation in a wide variety of applications.
In a paper published in the National Academy of Sciences Proceedings, the team notes that the human hand naturally emits infrared radiation. They figured out that it can be captured and used.
The human body emits light in the invisible infrared range, including the hands. The researchers noted that this radiation source could be detected and used in various applications, from signal generation to encryption systems. They also noted that since the hand has multiple fingers, the IR radiation can be considered multiplexed.
IR is a form of electromagnetic radiation. Its waves are longer than that of visible light, so people cannot observe them. Previous research has shown that the human body emits such radiation due to body heat. Electromagnetic radiation carries with it radiant energy, and its behavior is classified as a quantum particle and wave. Also, previous research has shown that electromagnetic radiation can be used in various applications, including medical imaging devices. And IR light, in particular, allows the use of night vision goggles, spectroscopic devices, and for the treatment of burn victims. In the new work, the researchers found that a minimal amount of infrared radiation from human hands is sufficient for various devices.
Scientists began by creating a device that would separate the infrared radiation emitted by the hand from external infrared light. They then sprayed the low-reflective material onto the aluminum base. Scientists have found that together, these two devices can be used to encrypt messages at ambient temperatures.
The researchers speculate that their device proves that infrared radiation generated by human hands is sufficient to create devices based on it. They also point out that their device can be modified. The goal is to use your fingers as encryption keys.