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[en] We propose a new family of achromatic phase shifters for infrared nulling interferometry. These key optical components can be seen as optimized Fresnel rhombs, using the total internal reflection phenomenon, modulated or not. The total internal reflection indeed comes with a phase shift between the polarization components of the incident light. We propose a solution to implement this vectorial phase shift between interferometer arms to provide the destructive interference process needed to disentangle highly contrasted objects from one another. We also show that, modulating the index transition at the total internal reflection interface allows compensating for the intrinsic material dispersion in order to make the subsequent phase shift achromatic over especially broad bands. The modulation can be induced by a thin film of a well-chosen material or a subwavelength grating whose structural parameters are thoroughly optimized. We present results from theoretical simulations! together with preliminary fabrication outcomes and measurements for a prototype in Zinc Selenide.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Mawet, D.; University of Liege, Belgium
Hanot, Charles ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Lenaers, C.; University of Liege, Belgium
Riaud, Pierre ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Defrere, Denis ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Vandormael
Loicq, Jerôme ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Surdej, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Habraken, Serge ; Université de Liège - ULiège > Département de physique > Optique - Hololab - CSL (Centre Spatial de Liège)
Language :
English
Title :
Fresnel rhombs as achromatic phase shifters for infrared nulling interferometry
Publication date :
01 September 2007
Journal title :
Optics Express
eISSN :
1094-4087
Publisher :
Optical Society of America, Washington, United States - District of Columbia
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