Surface Structured Optical Coatings with Near-Perfect Broadband and Wide-Angle Antireflective Properties

William McMahon, Emmett Perl, Robert Farrell, Steven DenBaars, James Speck, John Bowers

Research output: Contribution to journalArticlepeer-review

42 Scopus Citations

Abstract

Optical thin-film coatings are typically limited to designs where the refractive index varies in only a single dimension. However, additional control over the propagation of incoming light is possible by structuring the other two dimensions. In this work, we demonstrate a three-dimensional surface structured optical coating that combines the principles of thin-film optical design with bio-inspired nanostructures to yield near-perfect antireflection. Using this hybrid approach, we attain average reflection losses of 0.2% on sapphire and 0.6% on gallium nitride for 300-1800 nm light. This performance is maintained to very wide incidence angles, achieving less than 1% reflection at all measured wavelengths out to 45° for sapphire. This hybrid design has the potential to significantly enhance the broadband and wide-angle properties for a number of optical systems that require high transparency.

Original languageAmerican English
Pages (from-to)5960-5964
Number of pages5
JournalNano Letters
Volume14
Issue number10
DOIs
StatePublished - 8 Oct 2014

Bibliographical note

Publisher Copyright:
© 2014 American Chemical Society.

NREL Publication Number

  • NREL/JA-5J00-63344

Keywords

  • antireflective nanostructures
  • biomimetics
  • diffractive optics
  • Subwavelength structures
  • thin films

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