Bragg-Berry mirrors: reflective broadband q-plates
Language
en
Article de revue
This item was published in
Optics Letters. 2016-08-23, vol. 41, n° 17, p. 3972 - 3975
Optical Society of America - OSA Publishing
English Abstract
We report on the experimental realization of flat mirrors enabling the broadband generation of optical vortices upon reflection. The effect is based on the geometric Berry phase associated with the circular Bragg reflection ...Read more >
We report on the experimental realization of flat mirrors enabling the broadband generation of optical vortices upon reflection. The effect is based on the geometric Berry phase associated with the circular Bragg reflection phenomenon from chiral uniaxial media. We show the reflective optical vortex generation from both diffractive and nondiffractive paraxial light beams using spatially patterned chiral liquid crystal films. The intrinsic spectrally broadband character of spin-orbit generation of optical phase singularities is demonstrated over the full visible domain. Our results do not rely on any birefringent retardation requirement and, consequently, foster the development of a novel generation of robust optical elements for spin-orbit photonic technologies.Read less <
English Keywords
Chiral media
Liquid crystals
Optical vortices
Origin
Hal imported