Subwavelength surface-relief gratings for stellar coronagraphy

Details Subwavelength surface-relief gratings for stellar coronagraphy Subwavelength surface-relief gratings for stellar coronagraphy

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apopt..44.7313m&link_type=abstract

Applied Optics IP, vol. 44, Issue 34, pp.7313-7321

Physics

Optics

5

Phase Shift, Optical Systems Design

Scientific paper

We present a new design of a phase mask coronagraph implemented with subwavelength diffractive optical elements consisting of optimized surface-relief gratings. Phase mask coronagraphy is a recent technique that seeks to accommodate both high dynamic and high angular resolution imaging of faint sources around bright astrophysical objects such as exoplanets orbiting their host stars. The original design we propose is a new, integrated, and flexible solution to the pi phase-shift chromaticity of the phase mask coronagraphs. It will allow broadband observations, i.e., shorter integration times and object characterizations, by means of spectroscopic analysis. The feasibility of the component manufacturing is also considered through a tolerance study.

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