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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 24 — Dec. 2, 2013
  • pp: 29298–29303

Transmittance enhancement of sapphires with antireflective subwavelength grating patterned UV polymer surface structures by soft lithography

Soo Hyun Lee, Jung Woo Leem, and Jae Su Yu  »View Author Affiliations

Optics Express, Vol. 21, Issue 24, pp. 29298-29303 (2013)

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We report the total and diffuse transmission enhancement of sapphires with the ultraviolet curable SU8 polymer surface structures consisting of conical subwavelength gratings (SWGs) at one- and both-side surfaces for different periods. The SWGs patterns on the silicon templates were transferred into the SU8 polymer film surface on sapphires by a simple and cost-effective soft lithography technique. For the fabricated samples, the surface morphologies, wetting behaviors, and optical characteristics were investigated. For theoretical optical analysis, a rigorous coupled-wave analysis method was used. At a period of 350 nm, the sample with SWGs on SU8 film/sapphire exhibited a hydrophobic surface and higher total transmittance compared to the bare sapphire over a wide wavelength of 450-1000 nm. As the period of SWGs was increased, the low total transmittance region of < 85% was shifted towards the longer wavelengths and became broader while the diffuse transmittance was increased (i.e., larger haze ratio). For the samples with SWGs at both-side surfaces, the total and diffuse transmittance spectra were further enhanced compared to the samples with SWGs at one-side surface. The theoretical optical calculation results showed a similar trend to the experimentally measured data.

© 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:

Original Manuscript: September 20, 2013
Revised Manuscript: November 3, 2013
Manuscript Accepted: November 8, 2013
Published: November 19, 2013

Soo Hyun Lee, Jung Woo Leem, and Jae Su Yu, "Transmittance enhancement of sapphires with antireflective subwavelength grating patterned UV polymer surface structures by soft lithography," Opt. Express 21, 29298-29303 (2013)

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