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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 28 — Oct. 1, 2012
  • pp: 6839–6843

Porous anodic alumina with low refractive index for broadband graded-index antireflection coatings

Junwu Chen, Biao Wang, Yi Yang, Yuanyuan Shi, Gaojie Xu, and Ping Cui  »View Author Affiliations

Applied Optics, Vol. 51, Issue 28, pp. 6839-6843 (2012)

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Materials with very low refractive index are essential to prepare broadband graded-index antireflection (AR) coatings. However, the availability of such materials is very limited. In this study, large-area (4cm×4cm) low refractive index porous anodic alumina (PAA) coatings on glass substrate were prepared successfully by electron-beam evaporation, electrochemical oxidation, and chemical etching method. The nanopore size of PAA film is smaller than 40 nm, and the refractive index of PAA film is n=1.08. Besides, five-layered graded-index broadband PAA coatings with refractive indices following the Gaussian profile were also prepared to noticeably eliminate the reflectance of glass over a broadband wavelength, and the lowest reflectivity is 0.64% at the wavelength of 534 nm at normal incidence. The PAA AR coatings having an omnidirectional nature are likely to have practical applications in photovoltaic cells and optical devices.

© 2012 Optical Society of America

OCIS Codes
(310.1210) Thin films : Antireflection coatings
(310.6860) Thin films : Thin films, optical properties
(310.4165) Thin films : Multilayer design
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Thin Films

Original Manuscript: July 2, 2012
Revised Manuscript: August 29, 2012
Manuscript Accepted: September 3, 2012
Published: September 27, 2012

Junwu Chen, Biao Wang, Yi Yang, Yuanyuan Shi, Gaojie Xu, and Ping Cui, "Porous anodic alumina with low refractive index for broadband graded-index antireflection coatings," Appl. Opt. 51, 6839-6843 (2012)

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