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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 4 — Feb. 1, 2005
  • pp: 527–533

Superhydrophobic antireflective silica films: fractal surfaces and laser-induced damage thresholds

Yao Xu, Dong Wu, Yu Han Sun, Zu Xing Huang, Xiao Dong Jiang, Xiao Feng Wei, Zhi Hong Li, Bao Zhong Dong, and Zhong Hua Wu  »View Author Affiliations


Applied Optics, Vol. 44, Issue 4, pp. 527-533 (2005)
http://dx.doi.org/10.1364/AO.44.000527


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Abstract

Several superhydrophobic antireflective silica films have been prepared by a solgel method that uses hexamethyl-disilizane (HMDS) as a modifier. In a high-power laser, laser-induced damage thresholds (LIDTs) of 23–30 J/cm2 were obtained at 1064-nm wavelength with 1-ns pulse duration. By atomic-force microscopy and optical microscopy, the fractal surfaces of films were studied, and multifractal spectra (MFSs) were calculated both before and after laser damage. The two-sided effect of HMDS on particle growth determined the surface fractal of a particle and the multifractal structure of a film’s surface. The bigger Δα was, both before and after laser damage, the lower the LIDT was. The effect of methyl groups should be included in the determination of the MFS of the LIDT.

© 2005 Optical Society of America

OCIS Codes
(140.3330) Lasers and laser optics : Laser damage
(160.6030) Materials : Silica
(160.6060) Materials : Solgel
(240.6490) Optics at surfaces : Spectroscopy, surface
(310.1210) Thin films : Antireflection coatings
(310.1620) Thin films : Interference coatings

History
Original Manuscript: August 19, 2003
Revised Manuscript: June 18, 2004
Manuscript Accepted: October 12, 2004
Published: February 1, 2005

Citation
Yao Xu, Dong Wu, Yu Han Sun, Zu Xing Huang, Xiao Dong Jiang, Xiao Feng Wei, Zhi Hong Li, Bao Zhong Dong, and Zhong Hua Wu, "Superhydrophobic antireflective silica films: fractal surfaces and laser-induced damage thresholds," Appl. Opt. 44, 527-533 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-4-527

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