Researchers have developed a new type of optical device that uses micro-silicon disks to integrate light with mechanical waves. This new device is highly customizable and compatible with commercial manufacturing processes and is a viable solution to improve sensor detection and movement performance.

Optical machinery used to detect the movement of light. They can be used as a low-power, high-efficiency building block accelerometer that can be used to detect the direction and movement of a smartphone and trigger the car's airbag in seconds of an accident. Scientists are working to miniaturize these devices and are more susceptible to exercise, stress and vibration.

Identifying the smallest motion scenarios requires very high levels of interaction or coupling between light waves for detection, where the mechanical waves are bound to motion. In the Optical Society's Optical Express magazine, researchers at the University of Campinas in Brazil reported that the coupling efficiency achieved with their new bull's eye disk design achieves the same performance as the best laboratory-based opto-mechanical devices The report matches.

State-of-the-art mechanical equipment is not a widely used device. The new bull's-eye disk device is made from a standard foundry for the manufacture of complementary metal-oxide-semiconductor (CMOS) The latter is for most digital cameras.

"Because this device is manufactured on a commercial CMOS foundry process, it can be replicated by any of the world's manufacturing facilities," said Thiago P. Mayer Alegre, a research team leader. "If thousands of people make it, they all do it the same way, because we adapt the device to the foundry manufacturing process, which is more of a manufacturing process than using specialized in-house manufacturing technologies Cheaper and faster. "

Make light and exercise combine

Most mechanical devices use the same mechanism to limit the wave of light and mechanical waves in the material to achieve wave interaction. However, this method limits the performance of optics because only certain materials work well with limited light and mechanical movement.

"Once you break the rules of light and mechanics, you can use any type of material," Alegre said. "It also makes it possible to adjust the equipment independently to work at some specific light or mechanical frequency."

Researchers created a 24-micron-wide silicon disk that uses different mechanisms to limit light and mechanical waves. Light is confined within the device for reflection, which causes the light to bounce around the edge of the disk and surrounds the outer portion of a circular ring. Researchers rounded the silicon disk to create the appearance of a bull's eye, the outer ring that locates the mechanical movement that interacts with the light. The disk is supported by a center dock that allows disk movement.

"Radial rings were used to limit light waves in other devices, but we applied this approach to mechanical waves," Alegre said. "Our optical mechanism was the first to use this radial ring for mechanical and optical coupling."

The flexibility of the design of the silicon disk means it can be used to sense more than just motion. For example, making a disk of laser material can produce a pulse or power level laser controlled by motion. The device can also be used for telecom applications that make very small and high frequency light modulators.

Researchers are further refining the design of their devices and manufacturing equipment using better CMOS foundry manufacturing processes. This reduces the amount of light lost to the disk and improves overall performance. They also wanted to make the device more pragmatic for the whole device by combining an integrated optical waveguide that enables light back and forth with a mere mechanical disk.

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