Reference : Use of subwavelength gratings in TIR incidence as achromatic phase shifters
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/65802
Use of subwavelength gratings in TIR incidence as achromatic phase shifters
English
Mawet, Dimitri [Université de Liège - ULG > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) > >]
Lenaerts, Cedric mailto [Université de Liège - ULg > > CSL (Centre Spatial de Liège) >]
Riaud, Pierre [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) >]
Habraken, Serge [Université de Liège - ULg > Département de physique > Optique - Hololab - CSL (Centre Spatial de Liège) >]
Vandormael, Denis [Université de Liège - ULg > > CSL (Centre Spatial de Liège) > >]
1-Oct-2005
Optics Express
Optical Society of America
13
22
8686-8692
Yes (verified by ORBi)
International
1094-4087
Washington
DC
[en] Interferometry ; phase shift
[en] Nulling interferometry constitutes a very promising technique in observational astrophysics. This method consists in attenuating the signal of a bright astrophysical object in order to detect much fainter nearby features, e.g. exoplanets around their host star. An on-axis destructive interference is created by adjusting the phases of the beams coming from various telescopes. The huge flux ratio between the parent star and the planet (106 in the thermal infrared) requires unprecedented high performance broadband phase shifters. We present a new design for these key components called Achromatic Phase Shifters (APS). We propose to use subwavelength diffractive optical elements under total internal reflection (TIR) incidence. Our component can be seen as an evolution of the Fresnel Rhomb technology.
Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
Researchers ; Professionals
http://hdl.handle.net/2268/65802
also: http://hdl.handle.net/2268/33166
10.1364/OPEX.13.008686
http://adsabs.harvard.edu/abs/2005OExpr..13.8686M

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