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Proceedings Paper

Thin film approach for π achromatic phase shifters
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Paper Abstract

Direct detection and characterization of Earth-like planets orbiting nearby stars are possible with nulling interferometry and coronagraphy in the thermal infrared. With these techniques, the star is extinguished by interference, with a ratio greater than 105 to allow planet detection. Generally, these techniques require a π phase shifter. In this paper, we investigate how thin film coatings can be used to design π achromatic phase shifters. The design, which provides a π phase shift upon reflection, is basically formed with a high reflectance mirror and an antireflection structure that can be designed without any constraint on their own phase properties. The principle of the design is detailed and numerical examples illustrates this concept.

Paper Details

Date Published: 25 February 2004
PDF: 8 pages
Proc. SPIE 5250, Advances in Optical Thin Films, (25 February 2004); doi: 10.1117/12.513404
Show Author Affiliations
Frederic Lemarquis, Institut Fresnel, CNRS-ENSPM (France)
Pierre Riaud, Observatoire de Paris-Meudon (France)


Published in SPIE Proceedings Vol. 5250:
Advances in Optical Thin Films
Claude Amra; Norbert Kaiser; H. Angus Macleod, Editor(s)

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