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USA Develops New Silicon-based Lasers Using Light-acoustic Coupling
Jul 04, 2018

Recently, Yale University of the United States has developed a new silicon laser 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 lasers 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, but the researchers said. It is difficult to let silicon emit laser light by electric injection. This problem has plagued scientists for more than ten years. In order 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."

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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 in which amplification exceeds losses, and second pointing to the counter-intuitive dynamics of the system. Although the system is an optical laser, it also produces very consistent supersonic waves.

The research results were published in the journal Science.