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dc.contributor.authorRao, Anirudha R.en_US
dc.contributor.authorSreekanth, Kandammathe Valiyaveeduen_US
dc.contributor.authorSreejith, Sivaramapanickeren_US
dc.contributor.authorJose, Vishalen_US
dc.contributor.authorPethe, Shreyaen_US
dc.contributor.authorSingh, Ranjanen_US
dc.identifier.citationRao, A. R., Sreekanth, K. V., Sreejith, S., Jose, V., Pethe, S. & Singh, R. (2022). Ultrasensitive detection of heavy metal ions with scalable singular phase thin film optical coatings. Advanced Optical Materials, 10(8), 2102623-.
dc.description.abstractIdentification of spectroscopically silent heavy-metal ions in environmental and bio-analytical samples has gained immense importance. Lowering the limit of detection of these ions at low concentrations is crucial for biomedicine and food safety applications. Optical chemical sensors have shown great potential in improving the sensing solutions for heavy-metal ions because of their fast and label-free detection capabilities. However, achieving high sensitivity without compromising on scalability and simplicity is challenging. Here, we experimentally demonstrate the detection of heavy metal ions at ultralow concentrations using lithography-free scalable thin film optical coatings that show singular behavior of phase of light at the point-of-darkness. Since the phase-sensitive optical techniques have shown superior sensitivity over traditional sensing techniques based on spectroscopy, we use this extreme phase change to detect zinc ions concentration down to femtomolar. In particular, it allows us to monitor very small changes in refractive index due to the real-time binding of zinc ions on a poly (lactic-co-glycolic acid) functionalized sensor surface. This cost-effective extreme sensitivity sensing platform can be used for the label-free detection of various heavy metal ions by properly functionalizing the sensor surface.en_US
dc.description.sponsorshipAgency for Science, Technology and Research (A*STAR)en_US
dc.relation.ispartofAdvanced Optical Materialsen_US
dc.rights© 2022 Wiley-VCH GmbH. All rights reserved.en_US
dc.titleUltrasensitive detection of heavy metal ions with scalable singular phase thin film optical coatingsen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.contributor.schoolSchool of Chemical and Biomedical Engineeringen_US
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.contributor.researchCentre for Disruptive Photonic Technologies (CDPT)en_US
dc.contributor.researchThe Photonics Instituteen_US
dc.subject.keywordsHeavy Metal Ionsen_US
dc.subject.keywordsNanophotonic Cavitiesen_US
dc.description.acknowledgementThe authors acknowledge the funding support from Advanced Manufacturing and Engineering (AME) Programmatic Grant (No. A18A5b0056) by Agency for Science, Technology and Research, Singapore.en_US
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