Ultrasound detector

World's smallest ultrasound detector

Scientists have developed the world's smallest ultrasound detector, which is 100 times tinier than an average human hair, nad can visualize features that are much smaller than previously possible, an advance that may lead to better ways of studying ultra fi e details in tissues and materials.

According to the researchers from the German research center for Environmental health, the core detection technology for these very low frequency sound waves has for decades focused on using piezoelectric detectors which convert the pressure from sound waves into electrical voltage. They said imaging resolution archive using this process depend on the size of the piezoelectric detector employed,with with reduction in size leading to higher resolution .

In the new innovation,dubbed the silicon waveguide talon detector,or SWED and described in the journal nature, the scientists used silicon photonics technology to miniaturize optical components and densely pack them on the small surface of silicon chip.

While silicon doesn't exhibit any piezoelectricity ,they said its ability to confine light 9n dimensions smaller.than.the optical wave length could be applied for the development of tiny photonic circuits, which they applied to build SWED

This is the first time that a detector smaller than the size of a blood cell is used to detect ultrasound using the silicon photonics technology. said Rami Schneiderman, developer of SWED , and a co-author of the study .

The study noted that the size of SWED is about half a micron, which corresponds to an area that is at least 10,000 times smaller than the smallest piezoelectric detectors employed in clinical imaging applications.

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