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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 6 — Jun. 1, 2013
  • pp: 1665–1670

Broadband highly transparent sapphires with biomimetic antireflective compound submicrometer structures for optical and optoelectronic applications

Jung Woo Leem, Myung Sub Kim, and Jae Su Yu  »View Author Affiliations


JOSA B, Vol. 30, Issue 6, pp. 1665-1670 (2013)
http://dx.doi.org/10.1364/JOSAB.30.001665


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Abstract

We reported the broadband highly transparent sapphires with biomimetic antireflective compound submicrometer structures (c-SMSs) made of disordered nanocone arrays on closely packed ordered hemispherical submicrometer gratings (o-SMGs). The o-SMGs and nanocones were fabricated using the spin-coated silica spheres and thermally dewetted gold (Au) nanoparticles, respectively, as the etch masks by a dry etching. The silica spheres with an average diameter of 700±10nm were synthesized. The dot-like Au nanoparticles were formed from the Au thin films with different thicknesses by a proper heat treatment. The total and diffuse transmission characteristics of the fabricated c-SMSs on sapphires were investigated at wavelengths of 350–1100 nm, together with theoretical predictions using a rigorous coupled wave analysis simulation. For the c-SMSs with taller and larger nanocone arrays at 7 nm of Au film, an average total transmittance (Tavg) of 90.7% was obtained, exhibiting haze ratios (H) of 33.3 and 26% at λ=525 and 635 nm, respectively. These values were much higher than those of bare sapphire (i.e., Tavg85.4%, H5.4 and 3.7% at λ=525 and 635 nm, respectively). The surface of fabricated c-SMSs also exhibited a strong hydrophilic property with a low water contact angle of 10°.

© 2013 Optical Society of America

OCIS Codes
(160.4760) Materials : Optical properties
(220.4241) Optical design and fabrication : Nanostructure fabrication
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: February 15, 2013
Revised Manuscript: April 9, 2013
Manuscript Accepted: April 25, 2013
Published: May 23, 2013

Citation
Jung Woo Leem, Myung Sub Kim, and Jae Su Yu, "Broadband highly transparent sapphires with biomimetic antireflective compound submicrometer structures for optical and optoelectronic applications," J. Opt. Soc. Am. B 30, 1665-1670 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-6-1665

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