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Antireflective Surfaces via Subwavelength Etching

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AR surfaces with subwavelength surface-relief features provide ultrabroadband and angle-insensitive performance with the potential for higher laser-damage thresholds compared to thin-film coatings.

SHELBY AMENT, EDMUND OPTICS INC.

Antireflection (AR) coatings are essential for applications where light throughput is critical, or where backreflections cause issues. Such issues range from ghosts and glare in imaging applications to unwanted feedback or stray beams in laser applications. For a typical glass substrate, 4% to 8% of visible light is reflected off each bare surface, which can add up in multielement optical systems. Colorized subwavelength antirelection surfaces. Courtesy of Edmund Optics. Traditional thin-film AR coatings consist of multiple layers of materials deposited on a surface. These...Read full article

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