Open AccessElectrically controlled Fresnel zone plates made from ring-shaped 180° domains
Author(s) -
R. S. Cudney,
Luis A. Ríos,
H. M. Escamilla
Publication year - 2004
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.12.005783
Subject(s) - optics , zone plate , fresnel zone , materials science , lithium niobate , fresnel number , wafer , ferroelectricity , fresnel equations , refractive index , optoelectronics , physics , diffraction , dielectric
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%.