Researchers at IIT Kharagpur have introduced an innovative sensor technology that enables standard smartphone cameras to detect microscopic objects at an attomolar level. This breakthrough could significantly impact low-cost, portable medical diagnostics and other applications requiring sensitive detection.
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Collaborating with scientists from the University of Illinois Urbana-Champaign (UIUC), the IIT Kharagpur team developed a photonic crystal platform that enhances light signals by 1,300 times, allowing for the detection of substances previously invisible to the naked eye. By amplifying weak light signals from rhodamine molecules, the technology can convert smartphones into effective diagnostic tools.
This sensor is expected to be especially beneficial in both urban and rural settings, considering the widespread availability of smartphones. The enhanced photonic crystal enhances the interaction between light and matter, which, when integrated with artificial intelligence and machine learning, could open new avenues in healthcare diagnostics and beyond.
The technology operates by boosting weak light emissions from specific reporter molecules. The photonic crystals, composed of meticulously arranged structures significantly smaller than a human hair, create optical "hot spots" that intensify light interactions. This innovation not only reduces reliance on expensive detection equipment but also facilitates making diagnostic tools smaller and more mobile.
Prof. Shivakiran Bhaktha and his team at IIT Kharagpur, alongside Prof. Brian T. Cunningham and his research group at UIUC, engineered these photonic crystals using nanoparticles like gold, titania, and graphene oxide. Their findings, published in the journal Advanced Optical Materials, emphasize the potential of this technology in early disease detection and other fields requiring rapid, affordable, and sensitive detection capabilities.