Shulou(Shulou.com)11/24 Report--

CTOnews.com, May 14 (Xinhua) scientists at Pennsylvania State University in the United States have developed a new type of image sensor based on the design of nature, which can imitate the human eye's perception of red, green and blue and the processing of neural networks, thus producing high-quality images.

The retina of the human eye contains conical cells sensitive to red, green and blue light, and a neural network begins to process what we see before it reaches the brain. "this natural process creates a rich and colorful world that we can see." Said Kai Wang, a researcher on the project.

To do this in man-made devices, scientists used narrow-band perovskite photodetectors to mimic our conical cells and connect them to a neural-like algorithm that mimics our neural network to process information and reconstruct images. Photodetector is a device that can convert light energy into electrical signals, which is essential for cameras and many other optical technologies. Narrowband photodetectors can focus on individual parts of the spectrum, such as the red, green and blue colors that make up visible light.

"in this work, we found a novel way to design perovskite materials so that they are sensitive to only one wavelength of light." "We made three different perovskite materials that only react to red, green or blue," Kai Wang said.

This technology may represent a way to bypass the filters used in modern cameras, which reduce resolution and increase manufacturing complexity and cost. The silicon photodetectors in the camera can absorb light, but cannot distinguish between colors, scientists say. An external filter separates red, green and blue, allowing only one color to reach each part of the light sensor, wasting 2/3 of the incident light. "when the light is filtered, some information is lost." and this can be avoided through our design. so we think this work may represent the camera sensing technology of the future, which can help people achieve higher spatial resolution. "

And because scientists use perovskite materials, these new devices can also generate electricity when absorbing light, which may open the way for battery-free camera technology.

"the structure of the device is similar to a solar cell that uses light to generate electricity." "as long as you shine light on it, it generates an electric current," said Luyao Zheng, a postdoctoral fellow on the project. "so like our eyes, we don't need to exert energy to capture information from light."

The study could also lead to further developments in artificial retina biotechnology. Devices based on this technology may one day replace dead or damaged cells in our eyes and restore eyesight, scientists say.

CTOnews.com noted that the results of the study, published in the journal Scientific Progress, represent several fundamental breakthroughs in the realization of perovskite narrowband photodetectors, from material synthesis to device design to system innovation.

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