28 June 2006 Infrared achromatic phase shifters using modulated total internal reflection
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Abstract
We propose a new family of achromatic phase shifters that uses the modulated total internal reflection (TIR) phenomenon. These components can be seen as enhanced Fresnel rhombs for infrared applications like nulling interferometry and polarimetry. The TIR phenomenon comes with a differential phase shift between the polarization components of the incident light. Modulating the index transition at the TIR interface allows compensating for the intrinsic material dispersion in order to make the subsequent phase shift achromatic over broad bands. The modulation can be induced by a thin film of a well-chosen medium or a subwavelength grating whose parameters are specially optimized. We present results from theoretical simulations together with preliminary fabrication outcomes.
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Dimitri Mawet, Dimitri Mawet, Cédric Lenaerts, Cédric Lenaerts, Pierre Riaud, Pierre Riaud, Denis Vandormael, Denis Vandormael, Jérome Loicq, Jérome Loicq, David Verstraeten, David Verstraeten, Karl Fleury, Karl Fleury, Serge Habraken, Serge Habraken, Jean Surdej, Jean Surdej, "Infrared achromatic phase shifters using modulated total internal reflection", Proc. SPIE 6268, Advances in Stellar Interferometry, 62682J (28 June 2006); doi: 10.1117/12.671572; https://doi.org/10.1117/12.671572
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