Thin film approach for π achromatic phase shifters

Details Thin film approach for π achromatic phase shifters Thin film approach for π achromatic phase shifters

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5250..349l&link_type=abstract

Advances in Optical Thin Films. Edited by Amra, Claude; Kaiser, Norbert; Macleod, H. Angus. Proceedings of the SPIE, Volume 525

Physics

Scientific paper

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.

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