Active rejection-enhancement of spectrally tunable liquid crystal geometric phase vortex coronagraphs - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Applied Physics Letters Année : 2022

Active rejection-enhancement of spectrally tunable liquid crystal geometric phase vortex coronagraphs

Nina Kravets
Urban Mur
  • Fonction : Auteur
Miha Ravnik
Slobodan Žumer

Résumé

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.
Fichier principal
Vignette du fichier
APL 2022 (Active rejection-enhancement of spectrally tunable liquid crystal geometric phase vortex coronagraphs).pdf (1.19 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04104056 , version 1 (23-05-2023)

Identifiants

Citer

Nina Kravets, Urban Mur, Miha Ravnik, Slobodan Žumer, Etienne Brasselet. Active rejection-enhancement of spectrally tunable liquid crystal geometric phase vortex coronagraphs. Applied Physics Letters, 2022, 121 (24), pp.241104. ⟨10.1063/5.0130078⟩. ⟨hal-04104056⟩

Collections

CNRS LOMA
9 Consultations
19 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More