2021-12-31

Scientists use magnetic fields to switch nano lasers to enhance the stability of optical signals

By yqqlm yqqlm

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787f7597eddea09 - Scientists use magnetic fields to switch nano lasers to enhance the stability of optical signals

lasers concentrate light into extremely bright beams, which are useful in various fields, such as broadband communication and medical diagnostic equipment. About a decade ago, tiny and extremely fast lasers called proton nanolasers were developed. These nano lasers may save more power than traditional lasers, and they have great advantages in many fields – for example, nano lasers improve the sensitivity of biosensors for medical diagnosis

so far, turning on and off nanolasers requires direct manipulation, either mechanically or using heat or light. Now, researchers have found a way to remotely control nano lasers. “The innovation here is that we can control the luminescence signal with an external magnetic field. By changing the magnetic field around our magnetic nanostructures, we can turn on or off the laser,” said Professor Sebastiaan van dijken of the University of Alto

the team achieved this goal by making proton nano lasers from different materials. Instead of using the usual precious metals, such as gold or silver, they used magnetic cobalt platinum nanoparticles patterned on continuous gold and insulating silica layers. Their analysis shows that the arrangement of materials and nanodots in periodic arrays is a necessary condition for this effect

this new control mechanism may prove useful in a series of devices using optical signals, but its impact on the emerging field of topological photonics is even more exciting. Topological photonics aims to generate optical signals free from external interference. This will be applied in many fields by providing very robust signal processing