Journal
NANO LETTERS
Volume 14, Issue 10, Pages 5960-5964Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl502977f
Keywords
Subwavelength structures; biomimetics; diffractive optics; thin films; antireflective nanostructures
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Funding
- Center for Energy Efficient Materials, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001009]
- National Science Foundation Graduate Research Fellowship [DGE-1144085]
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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 3001800 nm light. This performance is maintained to very wide incidence angles, achieving less than 1% reflection at all measured wavelengths out to 45 degrees 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.
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