Microfabricated Fresnel Zone Plate Optical Tweezer (IMAGE)

Harvard University

Microfabricated Fresnel Zone Plate Optical Tweezer

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 100¼m, and the focal length is 8¼m. (b). CCD camera image of fluorescent bead (2¼m diameter) trapped in Zone Plate focus.

Credit

Ken Crozier, Harvard School of Engineering and Applied Sciences

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