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Annular Groove Phase Mask coronagraph in diamond for mid-IR wavelengths: manufacturing assessment and performance analysis

Delacroix, C. and Forsberg, P. and Karlsson, M. and Mawet, D. and Lenaerts, C. and Habraken, S. and Hanot, C. and Surdej, J. and Boccaletti, A. and Baudrand, J. (2010) Annular Groove Phase Mask coronagraph in diamond for mid-IR wavelengths: manufacturing assessment and performance analysis. In: Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave. Proceedings of SPIE. No.7731. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 77314W. ISBN 978-0-81948-221-1. https://resolver.caltech.edu/CaltechAUTHORS:20150526-150116703

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Abstract

Phase-mask coronagraphs are known to provide high contrast imaging capabilities while preserving a small inner working angle, which allows searching for exoplanets or circumstellar disks with smaller telescopes or at longer wavelengths. The AGPM (Annular Groove Phase Mask, Mawet et al. 2005) is an optical vectorial vortex coronagraph (or vector vortex) induced by a rotationally symmetric subwavelength grating (i.e. with a period smaller than λ/n, λ being the observed wavelength and n the refractive index of the grating substrate). In this paper, we present our first midinfrared AGPM prototypes imprinted on a diamond substrate. We firstly give an extrapolation of the expected coronagraph performances in the N-band (~10 μm), and prospects for down-scaling the technology to the most wanted L-band (~3.5 μm). We then present the manufacturing and measurement results, using diamond-optimized microfabrication techniques such as nano-imprint lithography (NIL) and reactive ion etching (RIE). Finally, the subwavelength grating profile metrology combines surface metrology (scanning electron microscopy, atomic force microscopy, white light interferometry) with diffractometry on an optical polarimetric bench and cross correlation with theoretical simulations using rigorous coupled wave analysis (RCWA).


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.858278 DOIArticle
http://arxiv.org/abs/1412.0395arXivDiscussion Paper
ORCID:
AuthorORCID
Karlsson, M.0000-0002-2011-0851
Mawet, D.0000-0002-8895-4735
Surdej, J.0000-0002-7005-1976
Boccaletti, A.0000-0001-9353-2724
Additional Information:© 2010 Society of Photo-Optical Instrumentation Engineers (SPIE). August 10, 2010. We gratefully acknowledge the help of Prof. Markku Kuittinen, Ismo Vartianen and Kari Leinonen (University of Joensuu, Finland) with lithography. C. Delacroix acknowledges the financial support of the Belgian “Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture”. The authors from the Liège University acknowledge support from the Communauté française de Belgique - Actions de recherche concertée - Académie universitaire Wallonie-Europe.
Funders:
Funding AgencyGrant Number
Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (FRIA)UNSPECIFIED
Communauté française de Belgique - Actions de recherche concertée - Académie universitaire Wallonie-EuropeUNSPECIFIED
Subject Keywords:coronagraphy, annular groove phase mask, vector vortex, achromaticity, ZOGs, subwavelength gratings
Series Name:Proceedings of SPIE
Issue or Number:7731
Record Number:CaltechAUTHORS:20150526-150116703
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150526-150116703
Official Citation:C. Delacroix ; P. Forsberg ; M. Karlsson ; D. Mawet ; C. Lenaerts, et al. "Annular groove phase mask coronagraph in diamond for mid-IR wavelengths: manufacturing assessment and performance analysis", Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77314W (August 10, 2010); doi:10.1117/12.858278
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57827
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:26 May 2015 22:27
Last Modified:09 Mar 2020 13:18

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