A plate bearing a series of concentric rings, alternately opaque and transparent. Such a device when placed in a beam of light brings the light to a focus by diffraction.(noun)
The Century Dictionary (Public Domain)
Use "zone-plate" in a sentence
"Image 2: This is a microscope image of the microfluidic and optical device, consisting of a flow-focus drop maker, six layers of drop splitters, followed by 64 parallel microfluidic channels, and a zone-plate array which is aligned to the microfluidic channel array at a tilt angle."
"Nanophotonics experts Schonbrun and Crozier originally developed the zone-plate technology to enhance optical tweezers so they could grab particles in a liquid using light."
"In their demonstration, a 62 element zone-plate array measured a fluorescence signal from drops traveling down 62 channels of a highly parallel microfluidic device."