Trapping various particles (IMAGE) Optica Caption Researchers developed contour-tracking optical tweezers that can trap large and irregularly shaped particles such as the ones pictured. The blue dots show illumination points while the red dots depict the contours extracted by the new method. Credit Takahashi-Michihata Lab, The University of Tokyo Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.