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The detection of nanoscale objects is crucial in applications such as biomedical diagnostics and environmental monitoring. In article number 1800262, Qinghai Song, Yun‐Feng Xiao, and co‐workers present an on‐chip dense waveguide sensor, which pushes the detection limit of single particles down to 100 nm in size and significantly decreases the sample consumption volumes.
Ultrasensitive and rapid detection of nano‐objects is crucial in both fundamental studies and practical applications. Optical sensors using evanescent fields in microcavities, plasmonic resonators, and nanofibers allow label‐free detection down to single molecules, but practical applications are severely hindered by long response time and device reproducibility. Here, an on‐chip dense waveguide sensor...
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