The 'superpower' of science fiction movies has taken a step toward reality. British researchers have developed an ultra-thin flexible laser film that can be attached to the surface of optical components such as contact lenses. As a unique identification mark for security verification.
In recent years, with the rapid development of flexible electronic technology, organic semiconductor materials have been widely used in the field of flexible wearable devices and biomedicine due to their extensibility and stretchability. A research team at the University of St Andrews in the United Kingdom has used organic materials. The flexible thin-film laser made of semiconducting polymer has a thickness of only 200 nanometers. Under light irradiation, the polymer can be stimulated to emit laser light.
The researchers said that if you change the material of the film and adjust the grating beam of the laser, the emitted laser can display a series of specific lines on a flat background, similar to a bar code consisting of 0 and 1, so that a unique safety mark is obtained. , can be read with a security scanner.
According to researcher Mart Gart, this laser film can be attached to different surfaces like ultra-thin stickers, such as banknotes. Experiments have shown that this kind of flexible laser film is not only good in elasticity, but also has stable optical properties. It is suitable for banknote anti-counterfeiting. .
The researchers attached an ultra-thin laser film to the surface of the contact lens and experimented with the bull's eye. Under the excitation of pulsed blue light, the green laser beam emitted by the film was successfully projected onto a screen about 50 centimeters away. They also posted a laser film. On the nail, it is confirmed that it can be applied to biometrics.
The results of the research were published in the latest issue of the British "Nature and Communications" magazine.