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All-optical Mie void sensor for complex nanoplastic mixtures
Summary
Scientists have invented a new light-based sensor that can detect tiny plastic particles, smaller than 500 nanometers, far too small to see, by trapping them in specially designed nanoscale pockets and identifying their shape and plastic type using color signals. This matters because nanoplastics can carry toxic chemicals and are increasingly found in our food, water, and even our bodies, but until now they've been extremely hard to detect and study. This new tool could help researchers track these hidden pollutants more quickly and accurately, which is a key step toward understanding their real risks to human health.
The fragmentation and direct release of plastic debris have emerged as a pressing ecological concern. Once dispersed, these particles infiltrate food webs, accumulate within organisms, and bind toxic co-contaminants, posing long-term risks to ecosystems and human health. Despite growing awareness, the characterization of nanoplastics remains highly challenging. Moreover, obtaining additional information, such as particle shape or material composition, further exacerbates these detection hurdles. Here, we introduce a photonic sensing platform based on nanoscale voids that enables the simultaneous material- and morphology-sensitive detection of particles below 500 nm. Void arrays embedded in a high-refractive-index material act in parallel as both sorting elements and color reporters. Spherical and elongated particles are selectively trapped in circular and elliptical voids, while different polymer types are distinguished simultaneously. This approach offers a scalable route toward optical identification of nanoplastics in environmental settings. Its compatibility with high-throughput analysis positions it as a promising tool for real-time studies.