Focusing of light by zone plates in Selfoc gradient-index lenses.
We study the diffraction fields in a hybrid diffractive-gradient-index element composed of an amplitude zone plate and a quarter-pitch Selfoc gradient-index lens under uniform illumination. Focal positions of the diffractive orders and zone-plate diffraction efficiencies are measured, thereby validating the existing theoretical results.
Rivas-Moscoso
José Manuel
JM
GRIN Optics Group, Departamento de Física Aplicada, Escola de Optica e Optometría, Universidade de Santiago de Compostela, Campus Sur, E15782 Santiago de Compostela, Spain. moskeh@usc.es
Nieto
Daniel
D
Gómez-Reino
Carlos
C
Fernández-Pousa
Carlos R
CR