Modification of porous silica antireflective coatings with fluorine-containing organosilicon

Qinghua Zhang, Wei Yang, Hongju Ma, Ping Ma, Qiao Xu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Antireflective (AR) coatings prepared from colloidal suspensions of silica are porous and quite polar due to residual Si-OH. So the silica coatings readily absorb water or organic vapor which is detrimental to the optical performance. In order to improve the stability of AR coating, two series of antireflective coatings are prepared by sol-gel process with tetraethoxysilane as a precursor. All of them are modified with trimethoxy (3, 3, 3-trifluoropropyl)-silane and diethoxymethyl (3, 3, 3-trifluoropropyl)-silane. Experimental results show that hydrophobic performance of the coatings is enhanced significantly. The anti-reflectivity of the coating is high when the mass fraction of CF3-CH2-CH2-Si or CF3-CH2-CH2-Si-CH3 is between 0.40%-1.5%. At a certain mass fraction of fluorine-containing siloxane, the performance of high laser damage threshold is not affected obviously. A series of tests are carried out by exposuring the coatings to vapor contamination in 10-3 Pa vacuum chamber. The test results indicate that the stability and life of AR coatings are improved greatly.

Original languageEnglish
Pages (from-to)1719-1723
Number of pages5
JournalGuangxue Xuebao/Acta Optica Sinica
Volume29
Issue number6
DOIs
StatePublished - Jun 2009
Externally publishedYes

Keywords

  • Antireflective coating
  • Fluorine-containing siloxane
  • Silica
  • Sol-gel
  • Stability
  • Thin film optics

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