Reference : Annular groove phase mask coronagraph in diamond for mid-IR wavelengths: manufacturing a...
Scientific congresses and symposiums : Paper published in a book
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/81723
Annular groove phase mask coronagraph in diamond for mid-IR wavelengths: manufacturing assessment and performance analysis
English
Delacroix, Christian mailto [Université de Liège - ULg > Département de physique > Optique - Hololab >]
Forsberg, P. [Uppsala Univ. (Sweden)]
Karlsson, M. [Uppsala Univ. (Sweden)]
Mawet, D. [Jet Propulsion Lab. (USA)]
Lenaerts, Cedric mailto [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
Habraken, Serge mailto [Université de Liège - ULg > Département de physique > Optique - Hololab - CSL (Centre Spatial de Liège) >]
Hanot, Charles [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Surdej, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Boccaletti, A. [Observatoire de Paris à Meudon (France)]
Baudrand, J. [Observatoire de Paris à Meudon (France)]
1-Jul-2010
Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave
Oschmann, J.
Clampin, M.
MacEwen, H.
SPIE
Proc. SPIE 7731
157
No
No
International
SPIE
[en] 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[SUP]1[/SUP]) 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).
Researchers
http://hdl.handle.net/2268/81723
10.1117/12.858278
http://adsabs.harvard.edu/abs/2010SPIE.7731E.157D

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