Columbia University engineers have created groundbreaking nanoscale sensors capable of detecting minute forces through changes in light intensity or color. These 'all-optical' sensors offer the potential for remote force measurements without wires, opening new possibilities in robotics, biophysics, and beyond.
Researchers at the Columbia University School of Engineering and Applied Science have invented 'all-optical' nanoscale sensors of force that change intensity or color when you push or pull on them. This can help generate remote read-outs without the need for wires or connections, a press release said. Mechanical forces are part of both physical and biological processes. Measuring these forces remotely can help power applications in fields as diverse as robotics and cellular biophysics.
N) forces. However, individual sensors that can measure across a wide dynamic range have not been developed to date. A team of engineers at Columbia University led by Jim Schuck, along with Cohen and Chan groups at the Lawrence Berkeley National Lab, developed sensors with the largest dynamic range inThe researchers built upon previous research from Schuck lab, which found a photon-avalanching effect within nanocrystals. In these particles, the absorption of a photon sets off a chain reaction that leads to the emission of many more photons. It is a non-linear and highly volatile reaction that takes place inside the crystals doped with rare-earth elements from the lanthanide row of elements from the periodic table. For this work, Schuck and his collaborators used thulium. The researchers had previously found that photon-avalanching is a highly sensitive process. One of the many factors that affect it is the spacing of the lanthanide ions. When they probed photon avalanching nanoparticles (ANPs) with atomic force microscopy (AFP) tips, they noted that avalanching behavior was impacted greatly by the gentle forces. In a photon avalanche, the absorption of a single photon sets off a chain reaction, leading to the emission of many photon
Nanotechnology Sensors Force Measurement Robotics Biophysics
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