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Wafer-scale highly-transparent and superhydrophilic sapphires for high-performance optics |
Optics Express, Vol. 20, Issue 24, pp. 26160-26166 (2012)
http://dx.doi.org/10.1364/OE.20.026160
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Abstract
We reported the wafer-scale highly-transparent and superhydrophilic sapphires with antireflective subwavelength structures (SWSs) which were fabricated by dry etching using thermally dewetted gold (Au) nanomasks. Their optical transmittance properties were experimentally and theoretically investigated. The density, size, and period of the thermally dewetted Au nanopatterns can be controlled by the Au film thickness. For the sapphire with both-side SWSs at 5 nm of Au film, the average total transmittance (Tavg) of ~96.5% at 350-800 nm was obtained, indicating a higher value than those of the flat sapphire (Tavg~85.6%) and the sapphire with one-side SWSs (Tavg~91%), and the less angle-dependent transmittance property was observed. The calculated transmittance results also showed a similar tendency to the measured data. The SWSs enhanced significantly the surface hydrophilicity of sapphires, exhibiting a water contact angle (θc) of < 5° for Au film of 5 nm compared to θc~37° of the flat sapphire.
© 2012 OSA
OCIS Codes
(160.4760) Materials : Optical properties
(220.4241) Optical design and fabrication : Nanostructure fabrication
(050.6624) Diffraction and gratings : Subwavelength structures
ToC Category:
Materials
History
Original Manuscript: August 30, 2012
Revised Manuscript: October 18, 2012
Manuscript Accepted: October 25, 2012
Published: November 5, 2012
Citation
Jung Woo Leem and Jae Su Yu, "Wafer-scale highly-transparent and superhydrophilic sapphires for high-performance optics," Opt. Express 20, 26160-26166 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-24-26160
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