title: Electrically controlled Fresnel zone plates made from ring-shaped 180 degrees domains.
abstract: We present high efficiency, low noise electrically-controlled Fresnel phase zone plates that were made by creating ring-shaped 180 degrees ferroelectric domains in a lithium niobate wafer. The primary focal lengths of these lenses ranged from 5 to 43 cm, and the light-gathering efficiency was over 37%, very close to the maximum theoretical value of 40.5%.
authors.forename: Roger
authors.initials: R
authors.lastname: Cudney
authors.forename: L
authors.initials: L
authors.lastname: Ríos
authors.forename: H
authors.initials: H
authors.lastname: Escamilla