Contact: Michael Patrick Rutter
Caption: (a). Photograph of microfabricated Fresnel Zone Plate optical tweezer, consisting of concentric gold rings (50 nm thick) on a microscope slide. The Zone Plate outer diameter is 100žm, and the focal length is 8žm. (b). CCD camera image of fluorescent bead (2žm diameter) trapped in Zone Plate focus.
Credit: Ken Crozier, Harvard School of Engineering and Applied Sciences
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Related news release: Engineers demonstrate a new type of optical tweezer