World's First Self-organizing Laser Born To Help Make Self-healing Smart Photonic Materials

In general, many man-made materials have their own advanced properties, but they have to combine the diversity and functionality of living materials to suit the latter's specific situation. For example, in the human body, bones and muscles are constantly reorganizing their structure and composition to better maintain changing weight and activity levels.
Recently, researchers from Imperial College London and University College London drew inspiration from this idea and demonstrated the world's first laser device that can spontaneously achieve self-organization, which can reconfigure itself when conditions change.
The team notes that this innovation will contribute to the development of smart photonic materials - materials that better mimic the properties of biological matter, such as responsiveness, adaptability, self-healing and collective behavior.
The lasers that power most of our technologies today are typically designed from crystalline materials and are precise and static in nature. The research team mentioned above, on the other hand, had the bright idea of creating a laser that could mix structure and function, allowing it to reconfigure itself and collaborate like a biological material.
Professor Riccardo Sapienza of Imperial College's Department of Physics, one of the study's co-authors, said, "Our laser system can reconfigure and collaborate to fit together, which will lay the groundwork for mimicking the evolving link between structure and function in biological materials."
In general, a laser can be defined as a device capable of producing a particular form of light by amplifying it. The self-assembled lasers in the team's experiments consisted of particles dispersed in a liquid with high gain (the ability to amplify light). Once enough of these particles are brought together, they can be excited with external energy to produce a laser.
In their experiments, an external laser was used to heat a "Janus" particle (a particle coated on one side with a light-absorbing material) around which the particles were clustered. These particle clusters produce a laser that can be turned on and off by varying the intensity of the external laser, which in turn controls the size and density of the particle cluster.
In addition, the team demonstrated how the laser clusters can be transported through space by heating different Janus particles, thus demonstrating the adaptability of the system. The "Janus" particles can also collaborate with each other to create clusters of particles that have more properties than simply adding two particles, such as changing their shape and enhancing their laser power.
Today, lasers are already widely used in medicine, telecommunications and industrial production," said co-lead author Dr. Giorgio Volpe from the Department of Chemistry at University College London. And lasers with bionic properties will help develop robust, autonomous, and durable next-generation materials and devices for sensing applications, unconventional computing, and new light sources and displays."
Next, the research team will study how to improve the autonomous behavior of lasers to make them more agile and lifelike. It is thought that the technology may be applied for the first time to the next generation of e-ink for smart displays.