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Related Experiment Videos

Study of a coronagraphic mask using evanescent waves.

Christophe Buisset, Yves Rabbia, Thierry Lepine

    Optics Express
    |April 7, 2017
    PubMed
    Summary

    The evanescent wave coronagraph (EvWaCo) mask, using frustrated total internal reflection, effectively removes starlight. This study shows EvWaCo achieves high contrast for detecting exoplanetary environments.

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    Area of Science:

    • Optical instrumentation
    • Exoplanet detection technologies
    • Astrophysical observation techniques

    Background:

    • Coronagraphs are essential for detecting faint objects near bright stars.
    • The evanescent wave coronagraph (EvWaCo) utilizes frustrated total internal reflection for starlight suppression.
    • Existing coronagraphs face challenges in achieving high contrast and broad spectral bandwidth.

    Purpose of the Study:

    • To theoretically and experimentally investigate the performance of the EvWaCo coronagraphic mask.
    • To assess the achromatic properties and contrast capabilities of the EvWaCo mask.
    • To evaluate the EvWaCo's potential for exoplanet detection by imaging stellar environments.

    Main Methods:

    • Theoretical calculation of the coronagraphic mask's transmission.

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  • Experimental validation using unpolarized light at a specific wavelength (λ≈900 nm).
  • Measurement of spectral bandwidth (Δλ/λ≈6%) and achieved contrast ratios.

    • Main Results:

    • The EvWaCo mask demonstrates partially achromatic properties.
    • Experimental results show a contrast ratio down to 10-6.
    • Effective starlight suppression was achieved at an angular distance of approximately ten Airy radii.

    Conclusions:

    • The EvWaCo mask is a promising technology for high-contrast imaging in astrophysics.
    • The demonstrated performance supports its application in the search for exoplanets.
    • Further development could enhance its achromaticity and broaden its operational bandwidth.