Recently, Yale University of the United States has developed a new silicon laser pointer using sound waves. Yale University professor of applied physics said: "In the past few years, we have seen explosive growth in silicon photonics. We are beginning to see these technologies enter consumer products, making our data centers run faster. We also discover new photons. Devices and technologies are expected to revolutionize in areas such as biosensing and on-chip quantum information."
"This rapid growth has forced people to develop new silicon laser pointer to power new circuits because of the historical difficulties caused by the indirect bandgap of silicon. The inherent properties of silicon are very helpful for many chip-scale optical technologies," the researchers said. But it is difficult to get silicon to radiate lasers with electric injection. This problem has plagued scientists for more than a decade. To avoid this problem, we need to find other ways to amplify the light on the chip - we use a combination of light and sound waves."
Light is amplified in the runway-shaped laser design fence to capture light in a circular motion. Runway design is a key part of innovation. In this way, we can put the light to the maximum and provide the maximum feedback for the lasing. In order to use sound waves to amplify light, silicon lasers have a special structure. Essentially, the special structure is a nano-scale waveguide designed to strictly limit light and sound waves and maximize the interaction between light and sound waves. This waveguide is unique in that there are two different optical transmission channels. This allows us to influence photoacoustic coupling with a fairly reliable and flexible laser design.
There are two main challenges in developing new lasers: first, designing and fabricating devices, the amplification in these laser pointers exceeds losses, and the second points to the counter-intuitive dynamics of the system. Although the system is an optical laser, it also produces very consistent supersonic waves.