28 July 2014 Mid-IR AGPMs for ELT applications
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Abstract
The mid-infrared region is well suited for exoplanet detection thanks to the reduced contrast between the planet and its host star with respect to the visible and near-infrared wavelength regimes. This contrast may be further improved with Vector Vortex Coronagraphs (VVCs), which allow us to cancel the starlight. One flavour of the VVC is the AGPM (Annular Groove Phase Mask), which adds the interesting properties of subwavelength gratings (achromaticity, robustness) to the already known properties of the VVC. In this paper, we present the optimized designs, as well as the expected performances of mid-IR AGPMs etched onto synthetic diamond substrates, which are considered for the E-ELT/METIS instrument.
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Brunella Carlomagno, Brunella Carlomagno, Christian Delacroix, Christian Delacroix, Olivier Absil, Olivier Absil, Pontus Forsberg, Pontus Forsberg, Serge Habraken, Serge Habraken, Aïssa Jolivet, Aïssa Jolivet, Mikael Karlsson, Mikael Karlsson, Dimitri Mawet, Dimitri Mawet, Pierre Piron, Pierre Piron, Jean Surdej, Jean Surdej, Ernesto Vargas Catalan, Ernesto Vargas Catalan, } "Mid-IR AGPMs for ELT applications", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914799 (28 July 2014); doi: 10.1117/12.2056280; https://doi.org/10.1117/12.2056280
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