Direct imaging; Earth-like planets; Exo-planets; High contrast; Infrared telescopes; Mask design; Metasurface; Optical-; Phase masks; Space-based
Abstract :
[en] The technique best suited for direct imaging of exoplanets is high contrast direct imaging using a coronagraph. In particular, the vortex coronagraph has proven to be one of the most promising approaches for imaging Earth-like planets with future space-based optical/infrared telescopes. However, differential polarization aberrations become difficult to control at the high contrasts required for this goal, requiring careful wavefront control in both polarizations independently. While the well-established vector vortex coronagraph is polarization-sensitive, a polarization-independent (scalar) vortex coronagraph circumvents this issue since it imprints the same phase ramp regardless of polarization [1]. Metasurfaces provide a promising approach for implementing a scalar vortex with relatively simple microfabrication techniques. The freedom introduced by different design topologies makes them a prime candidate for achieving achromatic performance.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
König, Lorenzo ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Planetary & Stellar systems Imaging Laboratory
Absil, Olivier ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Desai, Niyati; California Institute of Technology, Pasadena, United States
Mawet, Dimitri; California Institute of Technology, Pasadena, United States
Palatnick, Skyler; University of California at Santa Barbara, Santa Barbara, United States
Millar-Blanchaer, Maxwell; University of California at Santa Barbara, Santa Barbara, United States
Language :
English
Title :
A Metasurface-based Scalar Vortex Phase Mask Design
Publication date :
04 September 2023
Event name :
2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
Event organizer :
Optica
Event place :
Munich, Germany
Event date :
26 to 30 June 2023
Audience :
International
Main work title :
2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023
Publisher :
Institute of Electrical and Electronics Engineers Inc.
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Bibliography
G. Ruane et al., "Scalar vortex coronagraph mask design and predicted performance", Proc. SPIE 11117, 111171F (2019).
J. P. Hugonin and P. Lalanne, "RETICOLO software for grating analysis", arXiv:2101:00901 (2005).
A. J. Riggs et al., "Fast Linearized Coronagraph Optimizer (FALCO) I: A software toolbox for rapid coronagraphic design and wavefront correction", Proc. SPIE 10698, 106982V (2018).
C. Delacroix et al., "Laboratory demonstration of a mid-infrared AGPM vector vortex coronagraph", Astron. & Astrophys. 553, A98 (2013).
C. Hedlund et al., "Microloading effect in reactive ion etching", J. Vac. Sci. & Techn. A12, 1962 (1994).
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