Active rejection-enhancement of spectrally tunable liquid crystal geometric phase vortex coronagraphs
Language
en
Article de revue
This item was published in
Applied Physics Letters. 2022-12-14, vol. 121, n° 24, p. 241104
American Institute of Physics
English Abstract
Geometric phase optical elements made of space-variant anisotropic media customarily find their optimal operating conditions when a halfwave retardance condition is fulfilled, which allows imparting polarization-dependent ...Read more >
Geometric phase optical elements made of space-variant anisotropic media customarily find their optimal operating conditions when a halfwave retardance condition is fulfilled, which allows imparting polarization-dependent changes to an incident wavefront. In practice, intrinsic limitations of a man-made manufacturing process or a finite spectrum of a light source lead to a deviation from the ideal behavior. This implies an implementation of strategies to compensate for the associated efficiency losses. Here, we report on how the intrinsic tunable features of self-engineered liquid crystal topological defects can be used to enhance rejection capabilities of spectrally tunable vector vortex coronagraphs. We also discuss the extent of which current models enable to design efficient devices. The simplicity and decent performance of our approach offer the possibility to an amateur astronomy community to consider the use of vortex coronography.Read less <
Origin
Hal imported